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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /compiler/rustc_error_codes/src/error_codes/E0773.md | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0773.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0773.md | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0773.md b/compiler/rustc_error_codes/src/error_codes/E0773.md new file mode 100644 index 000000000..b19a58bf3 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0773.md @@ -0,0 +1,38 @@ +A builtin-macro was defined more than once. + +Erroneous code example: + +```compile_fail,E0773 +#![feature(decl_macro)] +#![feature(rustc_attrs)] + +#[rustc_builtin_macro] +pub macro test($item:item) { + /* compiler built-in */ +} + +mod inner { + #[rustc_builtin_macro] + pub macro test($item:item) { + /* compiler built-in */ + } +} +``` + +To fix the issue, remove the duplicate declaration: + +``` +#![feature(decl_macro)] +#![feature(rustc_attrs)] + +#[rustc_builtin_macro] +pub macro test($item:item) { + /* compiler built-in */ +} +``` + +In very rare edge cases, this may happen when loading `core` or `std` twice, +once with `check` metadata and once with `build` metadata. +For more information, see [#75176]. + +[#75176]: https://github.com/rust-lang/rust/pull/75176#issuecomment-683234468 |