mirror of https://github.com/rust-lang/rust
17 lines
523 B
Rust
17 lines
523 B
Rust
#![deny(single_use_lifetimes)]
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#![allow(dead_code)]
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#![allow(unused_variables)]
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// Test that we DO warn when lifetime name is used only
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// once in a fn argument.
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struct Foo {
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a: for<'a> fn(&'a u32), //~ ERROR `'a` only used once
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b: for<'a> fn(&'a u32, &'a u32), // OK, used twice.
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c: for<'a> fn(&'a u32) -> &'a u32, // OK, used twice.
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d: for<'a> fn() -> &'a u32, // OK, used only in return type.
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//~^ ERROR return type references lifetime `'a`, which is not constrained by the fn input types
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}
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fn main() { }
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