21 lines
640 B
Rust
21 lines
640 B
Rust
// Ensure that we don't consider `const Trait` and `~const Trait` to
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// match the macro fragment specifier `ty` as that would be a breaking
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// change theoretically speaking. Syntactically trait object types can
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// be "bare", i.e., lack the prefix `dyn`.
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// By contrast, `?Trait` *does* match `ty` and therefore an arm like
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// `?$Trait:path` would never be reached.
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// See `parser/macro/mbe-bare-trait-object-maybe-trait-bound.rs`.
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// check-pass
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macro_rules! check {
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($Type:ty) => { compile_error!("ty"); };
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(const $Trait:path) => {};
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(~const $Trait:path) => {};
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}
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check! { const Trait }
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check! { ~const Trait }
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fn main() {}
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