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https://github.com/rust-lang/rust
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a9841936fe
Change the implicit `Sized` `Obligation` `Span` for call expressions to include the whole expression. This aids the existing deduplication machinery to reduce the number of errors caused by a single unsized expression.
42 lines
895 B
Rust
42 lines
895 B
Rust
// Test if the on_unimplemented message override works
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#![feature(rustc_attrs)]
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struct Foo<T>(T);
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struct Bar<T>(T);
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#[rustc_on_unimplemented = "trait message"]
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trait Index<Idx: ?Sized> {
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type Output: ?Sized;
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fn index(&self, index: Idx) -> &Self::Output;
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}
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#[rustc_on_unimplemented = "on impl for Foo"]
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impl Index<Foo<usize>> for [i32] {
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type Output = i32;
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fn index(&self, _index: Foo<usize>) -> &i32 {
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loop {}
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}
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}
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#[rustc_on_unimplemented = "on impl for Bar"]
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impl Index<Bar<usize>> for [i32] {
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type Output = i32;
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fn index(&self, _index: Bar<usize>) -> &i32 {
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loop {}
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}
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}
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fn main() {
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Index::index(&[] as &[i32], 2u32);
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//~^ ERROR E0277
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//~| ERROR E0277
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Index::index(&[] as &[i32], Foo(2u32));
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//~^ ERROR E0277
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//~| ERROR E0277
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Index::index(&[] as &[i32], Bar(2u32));
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//~^ ERROR E0277
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//~| ERROR E0277
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}
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