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Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0468.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0468.md | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0468.md b/compiler/rustc_error_codes/src/error_codes/E0468.md new file mode 100644 index 000000000..cf8664718 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0468.md @@ -0,0 +1,27 @@ +A non-root module tried to import macros from another crate. + +Example of erroneous code: + +```compile_fail,E0468 +mod foo { + #[macro_use(debug_assert)] // error: must be at crate root to import + extern crate core; // macros from another crate + fn run_macro() { debug_assert!(true); } +} +``` + +Only `extern crate` imports at the crate root level are allowed to import +macros. + +Either move the macro import to crate root or do without the foreign macros. +This will work: + +``` +#[macro_use(debug_assert)] // ok! +extern crate core; + +mod foo { + fn run_macro() { debug_assert!(true); } +} +# fn main() {} +``` |