rust/tests/ui/regions/regions-escape-method.rs

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// Test a method call where the parameter `B` would (illegally) be
// inferred to a region bound in the method argument. If this program
// were accepted, then the closure passed to `s.f` could escape its
// argument.
struct S;
impl S {
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fn f<B, F>(&self, _: F) where F: FnOnce(&i32) -> B {
}
}
fn main() {
let s = S;
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s.f(|p| p) //~ ERROR lifetime may not live long enough
}