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Static cyclic references not compiled in current nightly rust version #62189
Description
Let's tying to compile this code.This code compiled ok on stable and on nightly-2019-06-17 (for example at rust play site)
struct Foo {
foo: Option<&'static Foo>
}
static FOO: Foo = Foo {
foo: Some(&FOO),
};
fn main() {
println!("Hello, world!");
}
But in current rustc 1.37.0-nightly (d3e2cec 2019-06-26) compilation fails with message:
error[E0391]: cycle detected when const-evaluating `FOO`
--> src/main.rs:6:1
|
6 | static FOO: Foo = Foo {
| ^^^^^^^^^^^^^^^^^^^^^
|
note: ...which requires const-evaluating `FOO`...
--> src/main.rs:6:1
|
6 | static FOO: Foo = Foo {
| ^^^^^^^^^^^^^^^^^^^^^
= note: ...which again requires const-evaluating `FOO`, completing the cycle
note: cycle used when const-evaluating + checking `FOO`
--> src/main.rs:6:1
|
6 | static FOO: Foo = Foo {
| ^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0391`.
Activity
[-]Static cyclic references compiled not compiled in current nightly rust version[/-][+]Static cyclic references not compiled in current nightly rust version[/+]wesleywiser commentedon Jun 28, 2019
Bisected to:
nightly-2019-06-19Oknightly-2019-06-20Fail04a3dd8...2fe7b33
cuviper commentedon Jun 28, 2019
I bisected to #58351, which is also part of the range @wesleywiser identified. I get build failures when I try to bisect further into the commits of that PR. cc @oli-obk @RalfJung
oli-obk commentedon Jun 28, 2019
Hmm curious, we do have tests for such situations. I'll investigate, but it'll drop into beta today. It's probably an easy fix
RalfJung commentedon Jun 28, 2019
Today? Beta cutoff is on Tuesday.
oli-obk commentedon Jun 28, 2019
Not this time I believe
wesleywiser commentedon Jun 28, 2019
Beta cutoff is 2019-06-29 https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/stable.20release/near/168974542
pnkfelix commentedon Jul 4, 2019
triage: P-high, remove nomination, assign to @oli-obk
RalfJung commentedon Jul 4, 2019
FYI, Oli is on vacation for 2 weeks.
RalfJung commentedon Jul 10, 2019
Should this be marked regression-from-stable-to-beta now?
Rollup merge of rust-lang#62982 - oli-obk:static_cycle, r=RalfJung