35 lines
811 B
Rust
35 lines
811 B
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// ignore-pretty pretty-printing is unhygienic
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#![feature(decl_macro)]
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trait Tr {
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fn f(&self) -> &'static str {
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"This shouldn't happen"
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}
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}
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pub macro m($t:ty) {
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impl Tr for $t {
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fn f(&self) -> &'static str {
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"Run me"
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}
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}
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}
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struct S;
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m!(S);
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fn main() {
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assert_eq!(S.f(), "Run me");
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}
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