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