error[E0659]: `std` is ambiguous --> $DIR/ambiguity-macros.rs:7:5 | LL | use std::io; | ^^^ ambiguous name | = note: ambiguous because of a conflict between a macro-expanded name and a less macro-expanded name from outer scope during import or macro resolution = note: `std` could refer to a built-in crate = help: use `::std` to refer to this crate unambiguously note: `std` could also refer to the module defined here --> $DIR/ambiguity-macros.rs:12:9 | LL | / mod std { LL | | pub struct io; LL | | } | |_________^ ... LL | m!(); | ---- in this macro invocation = help: use `crate::std` to refer to this module unambiguously = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to previous error For more information about this error, try `rustc --explain E0659`.