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Untruthful "there are multiple different versions of crate" #148892
Description
Code
// [dependencies]
// quote = "1"
use quote::quote;
use std::net::Ipv4Addr;
fn main() {
let ip = Ipv4Addr::LOCALHOST;
let _ = quote! { #ip };
}Current output
error[E0277]: the trait bound `Ipv4Addr: ToTokens` is not satisfied
--> src/main.rs:9:13
|
9 | let _ = quote! { #ip };
| ^^^^^^^^^^^^^^
| |
| the trait `ToTokens` is not implemented for `Ipv4Addr`
| required by a bound introduced by this call
|
note: there are multiple different versions of crate `quote` in the dependency graph
--> /home/david/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/quote-1.0.42/src/to_tokens.rs:9:1
|
9 | pub trait ToTokens {
| ^^^^^^^^^^^^^^^^^^ this is the expected trait
|
::: /home/david/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/proc_macro/src/to_tokens.rs:11:1
|
11 | pub trait ToTokens {
| ------------------ this is the trait that was imported
= help: you can use `cargo tree` to explore your dependency tree
= help: the following other types implement trait `ToTokens`:
&T
&mut T
Box<T>
CStr
CString
Cow<'a, T>
Option<T>
Rc<T>
and 24 others
= note: this error originates in the macro `quote` (in Nightly builds, run with -Z macro-backtrace for more info)Rationale and extra context
Rustc says "there are multiple different versions of crate quote in the dependency graph" and points to a ToTokens trait from version 1.0.42 of crate quote. As far as I understand, there is no other version of quote in the dependency graph. The diagnostic goes on to point to a different trait in crate proc_macro, but proc_macro is not a version of quote.
This diagnostic is new in nightly-2025-11-13 and is from #144674.
Rust Version
rustc 1.93.0-nightly (01867557c 2025-11-12)
binary: rustc
commit-hash: 01867557cd7dbe256a031a7b8e28d05daecd75ab
commit-date: 2025-11-12
host: x86_64-unknown-linux-gnu
release: 1.93.0-nightly
LLVM version: 21.1.5Anything else?
No response
Reacted by Oleg Shatov and Max Kamps
Activity
fmease commentedon Nov 13, 2025
cc @rperier
rperier commentedon Nov 13, 2025
Arf, sorry for the bug.
It seems to be caused by this line https://github.com/rust-lang/rust/blob/main/compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs#L386C1-L386C29 (the logic about external crate renamed symbol). Removing this line solves the issue.
I am goint to investigate.
@rustbot claim
Rollup merge of rust-lang#149001 - rperier:untruthful_multiple_differ…
Unrolled build for #149001