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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.
26 lines
535 B
Rust
26 lines
535 B
Rust
// Test if the on_unimplemented message override works
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#![feature(rustc_attrs)]
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#[rustc_on_unimplemented = "invalid"]
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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 = "a usize is required to index into a slice"]
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impl Index<usize> for [i32] {
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type Output = i32;
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fn index(&self, index: usize) -> &i32 {
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&self[index]
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}
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}
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fn main() {
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Index::<u32>::index(&[1, 2, 3] as &[i32], 2u32);
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//~^ ERROR E0277
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//~| ERROR E0277
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}
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