mirror of https://github.com/rust-lang/rust
27 lines
871 B
Rust
27 lines
871 B
Rust
// Test that we give a note when the old LUB/GLB algorithm would have
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// succeeded but the new code (which requires equality) gives an
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// error. However, now that we handle subtyping correctly, we no
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// longer get an error, because we recognize these two types as
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// equivalent!
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fn foo(x: fn(&u8, &u8), y: for<'a> fn(&'a u8, &'a u8)) {
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// The two types above are actually equivalent. With the older
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// leak check, though, we didn't consider them as equivalent, and
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// hence we gave errors. But now we've fixed that.
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let z = match 22 {
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0 => x,
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_ => y,
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//~^ ERROR `match` arms have incompatible types [E0308]
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};
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}
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fn foo_cast(x: fn(&u8, &u8), y: for<'a> fn(&'a u8, &'a u8)) {
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let z = match 22 {
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// No error with an explicit cast:
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0 => x as for<'a> fn(&'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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