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// edition:2018
// Check that lifetime resolver enforces the lifetime name scoping
// rules correctly in various scenarios.
struct Foo<'a> {
x: &'a isize
}
impl<'a> Foo<'a> {
// &'a is inherited:
fn m1(&self, arg: &'a isize) { }
fn m2(&'a self) { }
fn m3(&self, arg: Foo<'a>) { }
// &'b is not:
fn m4(&self, arg: &'b isize) { } //~ ERROR undeclared lifetime
fn m5(&'b self) { } //~ ERROR undeclared lifetime
fn m6(&self, arg: Foo<'b>) { } //~ ERROR undeclared lifetime
}
fn bar<'a>(x: &'a isize) {
// &'a is visible to code:
let y: &'a isize = x;
// &'a is not visible to *items*:
type X = Option<&'a isize>; //~ ERROR can't use generic parameters from outer item
enum E {
E1(&'a isize) //~ ERROR can't use generic parameters from outer item
}
struct S {
f: &'a isize //~ ERROR can't use generic parameters from outer item
}
fn f(a: &'a isize) { } //~ ERROR can't use generic parameters from outer item
// &'a CAN be declared on functions and used then:
fn g<'a>(a: &'a isize) { } // OK
fn h(a: Box<dyn for<'a> FnOnce(&'a isize)>) { } // OK
}
// Test nesting of lifetimes in fn type declarations
fn fn_types(a: &'a isize, //~ ERROR undeclared lifetime
b: Box<dyn for<'a> FnOnce(&'a isize,
&'b isize, //~ ERROR undeclared lifetime
Box<dyn for<'b> FnOnce(&'a isize,
&'b isize)>,
&'b isize)>, //~ ERROR undeclared lifetime
c: &'a isize) //~ ERROR undeclared lifetime
{
}
struct Bug {}
impl Bug {
async fn buggy(&self) -> &'a str { //~ ERROR use of undeclared lifetime name `'a`
todo!()
}
}
pub fn main() {}
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