mirror of https://github.com/rust-lang/rust
30 lines
1.0 KiB
Rust
30 lines
1.0 KiB
Rust
// Test taking the LUB of two function types that are not equatable but where one is more
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// general than the other. Test the case where the more general type (`x`) is the first
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// match arm specifically.
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//@ revisions: leak noleak
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//@[noleak] compile-flags:-Zno-leak-check
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fn foo(x: for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8, y: for<'a> fn(&'a u8, &'a u8) -> &'a u8) {
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// The two types above are not equivalent. With the older LUB/GLB
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// algorithm, this may have worked (I don't remember), but now it
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// doesn't because we require equality.
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let z = match 22 {
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0 => x,
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_ => y,
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//[leak]~^ ERROR `match` arms have incompatible types
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//[noleak]~^^ ERROR mismatched types
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};
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}
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fn foo_cast(x: for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8, y: for<'a> fn(&'a u8, &'a u8) -> &'a u8) {
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// But we can *upcast* explicitly the type of `x` and figure
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// things out:
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let z = match 22 {
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0 => x as for<'a> fn(&'a u8, &'a u8) -> &'a u8,
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_ => y,
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};
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}
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fn main() {}
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