Ambiguous glob import of main errors even in library crate #149412
Description
I compiled the following code with rustc --crate-type=lib repro.rs
mod a {
pub fn main() {}
}
mod b {
pub fn main() {}
}
use a::*;
use b::*;I expected the code to compile, but instead I got the following error:
error[E0659]: `main` is ambiguous
|
= note: ambiguous because of multiple glob imports of a name in the same module
note: `main` could refer to the function imported here
--> repro.rs:8:5
|
8 | use a::*;
| ^^^^
= help: consider adding an explicit import of `main` to disambiguate
note: `main` could also refer to the function imported here
--> repro.rs:9:5
|
9 | use b::*;
| ^^^^
= help: consider adding an explicit import of `main` to disambiguate
warning: unused import: `b::*`
--> repro.rs:9:5
|
9 | use b::*;
| ^^^^
|
= note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
error: aborting due to 1 previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0659`.
In a library crate, rustc shouldn't be caring whether a function is named main or not.
Renaming both functions from main to foo makes the code compile without errors.
Possibly relevant code:
rust/compiler/rustc_resolve/src/lib.rs
Line 1875 in 88bd39b
Meta
rustc --version --verbose:
rustc 1.93.0-nightly (80d8f292d 2025-11-25)
binary: rustc
commit-hash: 80d8f292d82d735f83417221dd63b0dd2bbb8dd2
commit-date: 2025-11-25
host: aarch64-apple-darwin
release: 1.93.0-nightly
LLVM version: 21.1.5