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error[E0659]: `std` is ambiguous
--> $DIR/ambiguity-macros.rs:7:5
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LL | use std::io;
| ^^^ ambiguous name
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= note: ambiguous because of multiple potential import sources
= 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
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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`.
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