mirror of https://github.com/rust-lang/rust
27 lines
517 B
Rust
27 lines
517 B
Rust
// Test that we DO warn for a lifetime on an impl used only in `&self`
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// in a trait method.
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#![deny(single_use_lifetimes)]
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#![allow(dead_code)]
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#![allow(unused_variables)]
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struct Foo<'f> {
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data: &'f u32
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}
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impl<'f> Iterator for Foo<'f> {
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type Item = &'f u32;
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fn next<'g>(&'g mut self) -> Option<Self::Item> { //~ ERROR `'g` only used once
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//~^ HELP elide the single-use lifetime
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None
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}
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}
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trait Bar<'a> {
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// But we should not warn here.
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fn bar(x: Foo<'a>);
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}
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fn main() {}
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