17 lines
412 B
Rust
17 lines
412 B
Rust
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// Check that `?Trait` matches the macro fragment specifier `ty`.
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// Syntactically trait object types can be "bare" (i.e., lack the prefix `dyn`),
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// even in newer editions like Rust 2021.
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// Therefore the arm `?$Trait:path` shouldn't get reached.
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//@ edition: 2021
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//@ check-pass
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macro_rules! check {
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($Ty:ty) => {};
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(?$Trait:path) => { compile_error!("non-ty"); };
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}
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check! { ?Trait }
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fn main() {}
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