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Don't suggest feature-gated paths on stable #101956
Description
This might well be a duplicate, but I couldn't find an existing bug. I ran into this with c_int.
fn main() {
let _: c_int;
}The output (with no dependencies) is
--> src/main.rs:2:12
|
2 | let _: c_int;
| ^^^^^ not found in this scope
|
help: consider importing one of these items
|
1 | use core::ffi::c_int;
|
1 | use std::os::raw::c_int;
Ideally the output should look like:
--> src/main.rs:2:12
|
2 | let _: c_int;
| ^^^^^ not found in this scope
|
help: consider importing one of these items
|
1 | use std::os::raw::c_int;
as core::ffi::c_int is unstable:
use core::ffi::c_int;
fn main() {
let _: c_int;
}Output:
error[E0658]: use of unstable library feature 'core_ffi_c'
--> src/main.rs:1:5
|
1 | use core::ffi::c_int;
| ^^^^^^^^^^^^^^^^
|
= note: see issue #94501 <https://github.com/rust-lang/rust/issues/94501> for more information
error[E0658]: use of unstable library feature 'core_ffi_c'
--> src/main.rs:3:12
|
3 | let _: c_int;
| ^^^^^
|
= note: see issue #94501 <https://github.com/rust-lang/rust/issues/94501> for more information
For more information about this error, try `rustc --explain E0658`.
Stable compiler version 1.63.0. This particular example works on Beta and Nightly, but presumably there are or will be other things in the standard library with a stable path and an unstable path.
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QuineDot commentedon May 4, 2023
This is indeed still happening with other unstable paths.
+use core::error::Error; fn main() -> Result<(), Box<dyn Error>> { Ok(()) }jakubadamw commentedon Apr 8, 2026
I believe this is a duplicate of #149402 that was fixed in #149440. It can be closed. @estebank, would you mind? 🙂