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Fix error output for invalid SBValue children - #165228

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Walnut356:invalid_sbvalue
Oct 31, 2026
Merged

Fix error output for invalid SBValue children#165228
rust-bors[bot] merged 1 commit into
rust-lang:mainfrom
Walnut356:invalid_sbvalue

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@Walnut356

@Walnut356 Walnut356 commented Oct 31, 2026 •
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LLDB has some weird inconsistencies around objects in invalid states.

(lldb) script type(lldb.SBValue().GetName())
<class 'NoneType'>
(lldb) script type(lldb.SBValue().GetTypeName())
<class 'NoneType'>
(lldb) script type(lldb.SBValue().GetType().GetName())
<class 'str'>
(lldb) script lldb.SBValue().GetType().GetName()
''

tl;dr, SBValue seems to tend to return None instead of empty strings? Whereas SBType tends to return an empty string. The last example is particularly baffling because .GetType().GetName() and .GetTypeName() should be doing literally exactly the same thing? Iunno.

In any case, the fact that None was sometimes returned lead to some error messages getting clobbered by an exception. This change ensures that all Child objects are initialized to a reasonable state (and an error is reported) in cases where we encounter invalid SBValue objects.

To verify the output, you can change the contents of this function to:

from lldb import SBValue
return SBValue()

and run ./x test tests/debuginfo/vec_visualizer

That should result in something along the lines of

Details 

(lldb) run
(lldb) repr vec_primitive
  [repr error: vec_primitive] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'core::num::niche_types::UsizeNoHighBit'] The following field(s) do not match (expected -> got):
    Field(name='__0', type='unsigned long', offset=0) -> Field(name='__0', type='usize', offset=0)
  [repr error: type 'usize'] type not found in input data
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] type not found in input data
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_primitive] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global>) vec_primitive = size=5 {
  buf = {inner:{ptr:{pointer:""}, cap:{0:5}, alloc:{}}, _marker:{}}
  len = 5
}, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr vec_ref
  [repr error: vec_ref] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<unsigned int *, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<unsigned int *, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_ref] The following children do not match (expected -> got):
    [0]: unsigned int * = None -> :  = None
    [1]: unsigned int * = None -> :  = None
    [2]: unsigned int * = None -> :  = None
    [3]: unsigned int * = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<unsigned int *, alloc::alloc::Global>) vec_ref = size=4 {
  buf = {inner:{ptr:{pointer:"\bTUUUU"}, cap:{0:4}, alloc:{}}, _marker:{}}
  len = 4
}, 'element_type': unsigned int *, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555d220 "\bTUUUU", 'length': 4})
(lldb) repr vec_endpad
  [repr error: vec_endpad] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_endpad] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_endpad] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::EndPad, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::EndPad, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_endpad] The following children do not match (expected -> got):
    [0]: main::EndPad = None -> :  = None
    [1]: main::EndPad = None -> :  = None
    [2]: main::EndPad = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::EndPad, alloc::alloc::Global>) vec_endpad = size=3 {
  buf = {inner:{ptr:{pointer:"\n"}, cap:{0:3}, alloc:{}}, _marker:{}}
  len = 3
}, 'element_type': struct EndPad {
private:
    unsigned int a;
    unsigned char b;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd70 "\n", 'length': 3})
(lldb) repr vec_midpad
  [repr error: vec_midpad] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_midpad] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_midpad] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::MidPad, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::MidPad, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_midpad] The following children do not match (expected -> got):
    [0]: main::MidPad = None -> :  = None
    [1]: main::MidPad = None -> :  = None
    [2]: main::MidPad = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::MidPad, alloc::alloc::Global>) vec_midpad = size=3 {
  buf = {inner:{ptr:{pointer:"\n"}, cap:{0:3}, alloc:{}}, _marker:{}}
  len = 3
}, 'element_type': struct MidPad {
private:
    unsigned char a;
    unsigned int b;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd90 "\n", 'length': 3})
(lldb) repr vec_generic_i32
  [repr error: vec_generic_i32] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_generic_i32] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_generic_i32] The following children do not match (expected -> got):
    [0]: main::Point<double> = None -> :  = None
    [1]: main::Point<double> = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>) vec_generic_i32 = size=2 {
  buf = {inner:{ptr:{pointer:""}, cap:{0:2}, alloc:{}}, _marker:{}}
  len = 2
}, 'element_type': template<> struct Point<double> {
private:
    double x;
    double y;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 16, 'data_ptr': (unsigned char *) pointer = 0x000055555555d1f0 "", 'length': 2})
(lldb) repr vec_generic_udt
  [repr error: vec_generic_udt] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_generic_udt] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_generic_udt] The following children do not match (expected -> got):
    [0]: main::Point<alloc::vec::Vec<int, alloc::alloc::Global> > = None -> :  = None
    [1]: main::Point<alloc::vec::Vec<int, alloc::alloc::Global> > = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>) vec_generic_udt = size=2 {
  buf = {inner:{ptr:{pointer:"\U00000002"}, cap:{0:2}, alloc:{}}, _marker:{}}
  len = 2
}, 'element_type': template<> struct Point<alloc::vec::Vec<int, alloc::alloc::Global>> {
private:
    alloc::vec::Vec<int, alloc::alloc::Global> x;
    alloc::vec::Vec<int, alloc::alloc::Global> y;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 48, 'data_ptr': (unsigned char *) pointer = 0x000055555555ddb0 "\U00000002", 'length': 2})
(lldb) repr ref_vec
  [repr error: ref_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ref_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ref_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ptr_vec
  [repr error: ptr_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ptr_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ptr_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ref_mut_vec
  [repr error: ref_mut_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ref_mut_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ref_mut_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ptr_mut_vec
  [repr error: ptr_mut_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ptr_mut_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ptr_mut_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr some_vec
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: some_vec.0] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
(lldb) repr some_empty_vec
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
some_empty_vec: Ok
(lldb) quit

The output probably still isn't optimal, but for the time being, this is infinitely more helpful than the "unrelated" exception we were getting before.

r? @jieyouxu, @Kobzol

@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 31, 2026
Kobzol
Kobzol approved these changes Oct 31, 2026
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Sigh, this GetTypeName() thing is annoying. Something that seems like an API shortcut should really behave in the same way as if you didn't use the shortcut. Shoo, inconsistent API!

Thanks.

@bors r+

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rust-bors Bot commented Oct 31, 2026

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📌 Commit b33e5d4 has been approved by Kobzol

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 5. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious failures

@rust-bors rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 31, 2026
@JonathanBrouwer JonathanBrouwer mentioned this pull request Oct 31, 2026
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JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Oct 31, 2026
@JonathanBrouwer
Rollup merge of rust-lang#165228 - Walnut356:invalid_sbvalue, r=Kobzol
648154d 
Fix error output for invalid `SBValue` children

LLDB has some weird inconsistencies around objects in invalid states.

```
(lldb) script type(lldb.SBValue().GetName())
<class 'NoneType'>
(lldb) script type(lldb.SBValue().GetTypeName())
<class 'NoneType'>
(lldb) script type(lldb.SBValue().GetType().GetName())
<class 'str'>
(lldb) script lldb.SBValue().GetType().GetName()
''
```

tl;dr, `SBValue` seems to tend to return `None` instead of empty strings? Whereas `SBType` tends to return an empty string. The last example is particularly baffling because `.GetType().GetName()` and `.GetTypeName()` should be doing literally exactly the same thing? Iunno.

In any case, the fact that `None` was sometimes returned lead to some [error messages getting clobbered by an exception](rust-lang#164975 (comment)). This change ensures that all `Child` objects are initialized to a reasonable state (and an error is reported) in cases where we encounter invalid `SBValue` objects.

To verify the output, you can change the contents of [this function](https://github.com/rust-lang/rust/blob/92b5b8c87c61b20adc9001b41baf587634a74734/src/etc/lldb_providers.py#L1175) to:

```py
from lldb import SBValue
return SBValue()
```

and run `./x test tests/debuginfo/vec_visualizer`

That should result in something along the lines of

<details><summary>Details</summary>
<p>

```
(lldb) run
(lldb) repr vec_primitive
  [repr error: vec_primitive] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'core::num::niche_types::UsizeNoHighBit'] The following field(s) do not match (expected -> got):
    Field(name='__0', type='unsigned long', offset=0) -> Field(name='__0', type='usize', offset=0)
  [repr error: type 'usize'] type not found in input data
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] type not found in input data
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_primitive] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global>) vec_primitive = size=5 {
  buf = {inner:{ptr:{pointer:""}, cap:{0:5}, alloc:{}}, _marker:{}}
  len = 5
}, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr vec_ref
  [repr error: vec_ref] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<unsigned int *, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<unsigned int *, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_ref] The following children do not match (expected -> got):
    [0]: unsigned int * = None -> :  = None
    [1]: unsigned int * = None -> :  = None
    [2]: unsigned int * = None -> :  = None
    [3]: unsigned int * = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<unsigned int *, alloc::alloc::Global>) vec_ref = size=4 {
  buf = {inner:{ptr:{pointer:"\bTUUUU"}, cap:{0:4}, alloc:{}}, _marker:{}}
  len = 4
}, 'element_type': unsigned int *, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555d220 "\bTUUUU", 'length': 4})
(lldb) repr vec_endpad
  [repr error: vec_endpad] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_endpad] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_endpad] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::EndPad, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::EndPad, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_endpad] The following children do not match (expected -> got):
    [0]: main::EndPad = None -> :  = None
    [1]: main::EndPad = None -> :  = None
    [2]: main::EndPad = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::EndPad, alloc::alloc::Global>) vec_endpad = size=3 {
  buf = {inner:{ptr:{pointer:"\n"}, cap:{0:3}, alloc:{}}, _marker:{}}
  len = 3
}, 'element_type': struct EndPad {
private:
    unsigned int a;
    unsigned char b;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd70 "\n", 'length': 3})
(lldb) repr vec_midpad
  [repr error: vec_midpad] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_midpad] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_midpad] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::MidPad, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::MidPad, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_midpad] The following children do not match (expected -> got):
    [0]: main::MidPad = None -> :  = None
    [1]: main::MidPad = None -> :  = None
    [2]: main::MidPad = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::MidPad, alloc::alloc::Global>) vec_midpad = size=3 {
  buf = {inner:{ptr:{pointer:"\n"}, cap:{0:3}, alloc:{}}, _marker:{}}
  len = 3
}, 'element_type': struct MidPad {
private:
    unsigned char a;
    unsigned int b;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd90 "\n", 'length': 3})
(lldb) repr vec_generic_i32
  [repr error: vec_generic_i32] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_generic_i32] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_generic_i32] The following children do not match (expected -> got):
    [0]: main::Point<double> = None -> :  = None
    [1]: main::Point<double> = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>) vec_generic_i32 = size=2 {
  buf = {inner:{ptr:{pointer:""}, cap:{0:2}, alloc:{}}, _marker:{}}
  len = 2
}, 'element_type': template<> struct Point<double> {
private:
    double x;
    double y;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 16, 'data_ptr': (unsigned char *) pointer = 0x000055555555d1f0 "", 'length': 2})
(lldb) repr vec_generic_udt
  [repr error: vec_generic_udt] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_generic_udt] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_generic_udt] The following children do not match (expected -> got):
    [0]: main::Point<alloc::vec::Vec<int, alloc::alloc::Global> > = None -> :  = None
    [1]: main::Point<alloc::vec::Vec<int, alloc::alloc::Global> > = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>) vec_generic_udt = size=2 {
  buf = {inner:{ptr:{pointer:"\U00000002"}, cap:{0:2}, alloc:{}}, _marker:{}}
  len = 2
}, 'element_type': template<> struct Point<alloc::vec::Vec<int, alloc::alloc::Global>> {
private:
    alloc::vec::Vec<int, alloc::alloc::Global> x;
    alloc::vec::Vec<int, alloc::alloc::Global> y;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 48, 'data_ptr': (unsigned char *) pointer = 0x000055555555ddb0 "\U00000002", 'length': 2})
(lldb) repr ref_vec
  [repr error: ref_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ref_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ref_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ptr_vec
  [repr error: ptr_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ptr_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ptr_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ref_mut_vec
  [repr error: ref_mut_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ref_mut_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ref_mut_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ptr_mut_vec
  [repr error: ptr_mut_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ptr_mut_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ptr_mut_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr some_vec
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: some_vec.0] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
(lldb) repr some_empty_vec
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
some_empty_vec: Ok
(lldb) quit
```

</p>
</details>

The output probably still isn't optimal, but for the time being, this is infinitely more helpful than the "unrelated" exception we were getting before.

r? @jieyouxu, @Kobzol
@JonathanBrouwer JonathanBrouwer mentioned this pull request Oct 31, 2026
Closed
rust-bors Bot pushed a commit that referenced this pull request Oct 31, 2026
@bors
Auto merge of #165243 - JonathanBrouwer:rollup-aA1G1JF, r=JonathanBro…
f9ceb4a 
…uwer

Rollup of 23 pull requests

Successful merges:

 - #163410 (Use a macro to reduce duplication in `core/src/num/f{16,32,64,128}.rs` (part 1))
 - #164290 (virtual function elimination: only use `type.checked.load` for function pointers)
 - #165113 (Limit lldb string summary length)
 - #165146 (Stop using LLVM struct types for array/pointer offset GEPs (rebase))
 - #165197 (Inline usages of `is_doc_keyword_or_attribute` and `is_rustc_doc_primitive`)
 - #165209 (Don't ICE when making diagnostic in `point_at_dyn_trait_in_field_def` if there's no `dyn Trait` field to point at)
 - #165228 (Fix error output for invalid `SBValue` children)
 - #153633 (feat: improve `Cell` doc)
 - #164686 (Add regression test for new solver hang on cyclic projection bound)
 - #164730 (core: Rename `abort_immediate` to `crash`)
 - #164937 (Add example for misaligned elements in `subslice_range`)
 - #165019 (Add safety section for from_utf8_unchecked/from_raw_parts)
 - #165035 (Suggest `gca!` for path const args that use generic params)
 - #165106 (Windows: Disallow some special chars in bat script names)
 - #165120 (Add regression test for overlap check hang with unresolved type in where clause)
 - #165158 (Tiny optimization to `TypeErrCtxt::report_inference_failure()`)
 - #165184 (GCI: Check where-clauses of associated constants for well-formedness)
 - #165190 (Improve delayed bug comment and message on first_method_vtable_slot)
 - #165196 (inhabitedness: use try_normalize_erasing_regions on ADT fields)
 - #165206 (tests: clarify dead_code_pub_in_binary FIXME after Cargo workaround)
 - #165214 (add MaybeUninit::from_ref)
 - #165225 (LoongArch: Restore `feature(stdarch_loongarch)` for bootstrap)
 - #165235 (two LLVM backend cleanups)

Failed merges:

 - #160370 (rustdoc: notable trait badge and popover enhancements)
 - #164981 (Reflection add TypeId::name)
@rust-bors
rust-bors Bot merged commit 6769288 into rust-lang:main Oct 31, 2026
14 checks passed
@rustbot rustbot added this to the 1.101.0 milestone Oct 31, 2026
rust-bors Bot pushed a commit that referenced this pull request Oct 31, 2026
@bors
Unrolled build for #165228 in rollup 165243
3e19411 
Rollup merge of #165228 - Walnut356:invalid_sbvalue, r=Kobzol

Fix error output for invalid `SBValue` children

LLDB has some weird inconsistencies around objects in invalid states.

```
(lldb) script type(lldb.SBValue().GetName())
<class 'NoneType'>
(lldb) script type(lldb.SBValue().GetTypeName())
<class 'NoneType'>
(lldb) script type(lldb.SBValue().GetType().GetName())
<class 'str'>
(lldb) script lldb.SBValue().GetType().GetName()
''
```

tl;dr, `SBValue` seems to tend to return `None` instead of empty strings? Whereas `SBType` tends to return an empty string. The last example is particularly baffling because `.GetType().GetName()` and `.GetTypeName()` should be doing literally exactly the same thing? Iunno.

In any case, the fact that `None` was sometimes returned lead to some [error messages getting clobbered by an exception](#164975 (comment)). This change ensures that all `Child` objects are initialized to a reasonable state (and an error is reported) in cases where we encounter invalid `SBValue` objects.

To verify the output, you can change the contents of [this function](https://github.com/rust-lang/rust/blob/92b5b8c87c61b20adc9001b41baf587634a74734/src/etc/lldb_providers.py#L1175) to:

```py
from lldb import SBValue
return SBValue()
```

and run `./x test tests/debuginfo/vec_visualizer`

That should result in something along the lines of

<details><summary>Details</summary>
<p>

```
(lldb) run
(lldb) repr vec_primitive
  [repr error: vec_primitive] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: vec_primitive] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'core::num::niche_types::UsizeNoHighBit'] The following field(s) do not match (expected -> got):
    Field(name='__0', type='unsigned long', offset=0) -> Field(name='__0', type='usize', offset=0)
  [repr error: type 'usize'] type not found in input data
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] type not found in input data
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_primitive] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global>) vec_primitive = size=5 {
  buf = {inner:{ptr:{pointer:""}, cap:{0:5}, alloc:{}}, _marker:{}}
  len = 5
}, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr vec_ref
  [repr error: vec_ref] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: vec_ref] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<unsigned int *, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<unsigned int *, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_ref] The following children do not match (expected -> got):
    [0]: unsigned int * = None -> :  = None
    [1]: unsigned int * = None -> :  = None
    [2]: unsigned int * = None -> :  = None
    [3]: unsigned int * = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<unsigned int *, alloc::alloc::Global>) vec_ref = size=4 {
  buf = {inner:{ptr:{pointer:"\bTUUUU"}, cap:{0:4}, alloc:{}}, _marker:{}}
  len = 4
}, 'element_type': unsigned int *, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555d220 "\bTUUUU", 'length': 4})
(lldb) repr vec_endpad
  [repr error: vec_endpad] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_endpad] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_endpad] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::EndPad, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::EndPad, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_endpad] The following children do not match (expected -> got):
    [0]: main::EndPad = None -> :  = None
    [1]: main::EndPad = None -> :  = None
    [2]: main::EndPad = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::EndPad, alloc::alloc::Global>) vec_endpad = size=3 {
  buf = {inner:{ptr:{pointer:"\n"}, cap:{0:3}, alloc:{}}, _marker:{}}
  len = 3
}, 'element_type': struct EndPad {
private:
    unsigned int a;
    unsigned char b;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd70 "\n", 'length': 3})
(lldb) repr vec_midpad
  [repr error: vec_midpad] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_midpad] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: vec_midpad] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::MidPad, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::MidPad, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_midpad] The following children do not match (expected -> got):
    [0]: main::MidPad = None -> :  = None
    [1]: main::MidPad = None -> :  = None
    [2]: main::MidPad = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::MidPad, alloc::alloc::Global>) vec_midpad = size=3 {
  buf = {inner:{ptr:{pointer:"\n"}, cap:{0:3}, alloc:{}}, _marker:{}}
  len = 3
}, 'element_type': struct MidPad {
private:
    unsigned char a;
    unsigned int b;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 8, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd90 "\n", 'length': 3})
(lldb) repr vec_generic_i32
  [repr error: vec_generic_i32] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_generic_i32] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_generic_i32] The following children do not match (expected -> got):
    [0]: main::Point<double> = None -> :  = None
    [1]: main::Point<double> = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::Point<double>, alloc::alloc::Global>) vec_generic_i32 = size=2 {
  buf = {inner:{ptr:{pointer:""}, cap:{0:2}, alloc:{}}, _marker:{}}
  len = 2
}, 'element_type': template<> struct Point<double> {
private:
    double x;
    double y;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 16, 'data_ptr': (unsigned char *) pointer = 0x000055555555d1f0 "", 'length': 2})
(lldb) repr vec_generic_udt
  [repr error: vec_generic_udt] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: vec_generic_udt] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>'] The following field(s) do not match (expected -> got):
    Field(name='len', type='unsigned long', offset=16) -> Field(name='len', type='usize', offset=16)
  [repr error: type 'alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>'] It appears these changes do not affect the type's providers. Consider rerunning with the `--bless` option
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'usize'] mismatch (see prior output for type 'usize')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: vec_generic_udt] The following children do not match (expected -> got):
    [0]: main::Point<alloc::vec::Vec<int, alloc::alloc::Global> > = None -> :  = None
    [1]: main::Point<alloc::vec::Vec<int, alloc::alloc::Global> > = None -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<main::Point<alloc::vec::Vec<int, alloc::alloc::Global> >, alloc::alloc::Global>) vec_generic_udt = size=2 {
  buf = {inner:{ptr:{pointer:"\U00000002"}, cap:{0:2}, alloc:{}}, _marker:{}}
  len = 2
}, 'element_type': template<> struct Point<alloc::vec::Vec<int, alloc::alloc::Global>> {
private:
    alloc::vec::Vec<int, alloc::alloc::Global> x;
    alloc::vec::Vec<int, alloc::alloc::Global> y;
}, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 48, 'data_ptr': (unsigned char *) pointer = 0x000055555555ddb0 "\U00000002", 'length': 2})
(lldb) repr ref_vec
  [repr error: ref_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ref_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ref_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ref_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ptr_vec
  [repr error: ptr_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ptr_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ptr_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ptr_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ref_mut_vec
  [repr error: ref_mut_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ref_mut_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ref_mut_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ref_mut_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr ptr_mut_vec
  [repr error: ptr_mut_vec] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: ptr_mut_vec] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: type ''] mismatch (see prior output for type '')
  [repr error: ptr_mut_vec] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
Synthetic Provider state:
  {'valobj': (alloc::vec::Vec<int, alloc::alloc::Global> *) ptr_mut_vec = 0x00007fffffffd918 size=5, 'element_type': int, 'no_hi_bit_max': 9223372036854775808, 'element_type_size': 4, 'data_ptr': (unsigned char *) pointer = 0x000055555555dd50 "", 'length': 5})
(lldb) repr some_vec
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(0) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(1) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(2) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(3) returned an invalid SBValue
  [repr error: some_vec.$variants$.$variant$.value.0] GetChildAtIndex(4) returned an invalid SBValue
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
  [repr error: some_vec.0] The following children do not match (expected -> got):
    [0]: int = -2147483648 -> :  = None
    [1]: int = -1 -> :  = None
    [2]: int = 0 -> :  = None
    [3]: int = 1 -> :  = None
    [4]: int = 2147483647 -> :  = None
(lldb) repr some_empty_vec
  [repr error: type 'alloc::vec::Vec<int, alloc::alloc::Global>'] mismatch (see prior output for type 'alloc::vec::Vec<int, alloc::alloc::Global>')
some_empty_vec: Ok
(lldb) quit
```

</p>
</details>

The output probably still isn't optimal, but for the time being, this is infinitely more helpful than the "unrelated" exception we were getting before.

r? @jieyouxu, @Kobzol
@jieyouxu jieyouxu assigned Kobzol and unassigned jieyouxu Nov 3, 2026
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@Kobzol Kobzol Kobzol approved these changes

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@Walnut356 @Kobzol @jieyouxu @rustbot