#![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() { } |