mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-10 23:24:24 +00:00
148 lines
4.7 KiB
Rust
148 lines
4.7 KiB
Rust
|
|
|
|
|
|
#![warn(needless_lifetimes, unused_lifetimes)]
|
|
#![allow(dead_code, needless_pass_by_value)]
|
|
|
|
fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) { }
|
|
|
|
fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) { }
|
|
|
|
fn same_lifetime_on_input<'a>(_x: &'a u8, _y: &'a u8) { } // no error, same lifetime on two params
|
|
|
|
fn only_static_on_input(_x: &u8, _y: &u8, _z: &'static u8) { } // no error, static involved
|
|
|
|
fn mut_and_static_input(_x: &mut u8, _y: &'static str) { }
|
|
|
|
fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 { x }
|
|
|
|
fn multiple_in_and_out_1<'a>(x: &'a u8, _y: &'a u8) -> &'a u8 { x } // no error, multiple input refs
|
|
|
|
fn multiple_in_and_out_2<'a, 'b>(x: &'a u8, _y: &'b u8) -> &'a u8 { x } // no error, multiple input refs
|
|
|
|
fn in_static_and_out<'a>(x: &'a u8, _y: &'static u8) -> &'a u8 { x } // no error, static involved
|
|
|
|
fn deep_reference_1<'a, 'b>(x: &'a u8, _y: &'b u8) -> Result<&'a u8, ()> { Ok(x) } // no error
|
|
|
|
fn deep_reference_2<'a>(x: Result<&'a u8, &'a u8>) -> &'a u8 { x.unwrap() } // no error, two input refs
|
|
|
|
fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> { Ok(x) }
|
|
|
|
// where clause, but without lifetimes
|
|
fn where_clause_without_lt<'a, T>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> where T: Copy { Ok(x) }
|
|
|
|
type Ref<'r> = &'r u8;
|
|
|
|
fn lifetime_param_1<'a>(_x: Ref<'a>, _y: &'a u8) { } // no error, same lifetime on two params
|
|
|
|
fn lifetime_param_2<'a, 'b>(_x: Ref<'a>, _y: &'b u8) { }
|
|
|
|
fn lifetime_param_3<'a, 'b: 'a>(_x: Ref<'a>, _y: &'b u8) { } // no error, bounded lifetime
|
|
|
|
fn lifetime_param_4<'a, 'b>(_x: Ref<'a>, _y: &'b u8) where 'b: 'a { } // no error, bounded lifetime
|
|
|
|
struct Lt<'a, I: 'static> {
|
|
x: &'a I
|
|
}
|
|
|
|
fn fn_bound<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
|
|
where F: Fn(Lt<'a, I>) -> Lt<'a, I> // no error, fn bound references 'a
|
|
{ unreachable!() }
|
|
|
|
fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
|
|
where for<'x> F: Fn(Lt<'x, I>) -> Lt<'x, I>
|
|
{ unreachable!() }
|
|
|
|
struct X {
|
|
x: u8,
|
|
}
|
|
|
|
impl X {
|
|
fn self_and_out<'s>(&'s self) -> &'s u8 { &self.x }
|
|
|
|
fn self_and_in_out<'s, 't>(&'s self, _x: &'t u8) -> &'s u8 { &self.x } // no error, multiple input refs
|
|
|
|
fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) { }
|
|
|
|
fn self_and_same_in<'s>(&'s self, _x: &'s u8) { } // no error, same lifetimes on two params
|
|
}
|
|
|
|
struct Foo<'a>(&'a u8);
|
|
|
|
impl<'a> Foo<'a> {
|
|
fn self_shared_lifetime(&self, _: &'a u8) {} // no error, lifetime 'a not defined in method
|
|
fn self_bound_lifetime<'b: 'a>(&self, _: &'b u8) {} // no error, bounds exist
|
|
}
|
|
|
|
fn already_elided<'a>(_: &u8, _: &'a u8) -> &'a u8 {
|
|
unimplemented!()
|
|
}
|
|
|
|
fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str { unimplemented!() }
|
|
|
|
// no warning, two input lifetimes (named on the reference, anonymous on Foo)
|
|
fn struct_with_lt2<'a>(_foo: &'a Foo) -> &'a str { unimplemented!() }
|
|
|
|
// no warning, two input lifetimes (anonymous on the reference, named on Foo)
|
|
fn struct_with_lt3<'a>(_foo: &Foo<'a> ) -> &'a str { unimplemented!() }
|
|
|
|
// no warning, two input lifetimes
|
|
fn struct_with_lt4<'a, 'b>(_foo: &'a Foo<'b> ) -> &'a str { unimplemented!() }
|
|
|
|
trait WithLifetime<'a> {}
|
|
|
|
type WithLifetimeAlias<'a> = WithLifetime<'a>;
|
|
|
|
// should not warn because it won't build without the lifetime
|
|
fn trait_obj_elided<'a>(_arg: &'a WithLifetime) -> &'a str { unimplemented!() }
|
|
|
|
// this should warn because there is no lifetime on Drop, so this would be
|
|
// unambiguous if we elided the lifetime
|
|
fn trait_obj_elided2<'a>(_arg: &'a Drop) -> &'a str { unimplemented!() }
|
|
|
|
type FooAlias<'a> = Foo<'a>;
|
|
|
|
fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str { unimplemented!() }
|
|
|
|
// no warning, two input lifetimes (named on the reference, anonymous on Foo)
|
|
fn alias_with_lt2<'a>(_foo: &'a FooAlias) -> &'a str { unimplemented!() }
|
|
|
|
// no warning, two input lifetimes (anonymous on the reference, named on Foo)
|
|
fn alias_with_lt3<'a>(_foo: &FooAlias<'a> ) -> &'a str { unimplemented!() }
|
|
|
|
// no warning, two input lifetimes
|
|
fn alias_with_lt4<'a, 'b>(_foo: &'a FooAlias<'b> ) -> &'a str { unimplemented!() }
|
|
|
|
fn named_input_elided_output<'a>(_arg: &'a str) -> &str { unimplemented!() }
|
|
|
|
fn elided_input_named_output<'a>(_arg: &str) -> &'a str { unimplemented!() }
|
|
|
|
fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) { unimplemented!() }
|
|
fn trait_bound<'a, T: WithLifetime<'a>>(_: &'a u8, _: T) { unimplemented!() }
|
|
|
|
// don't warn on these, see #292
|
|
fn trait_bound_bug<'a, T: WithLifetime<'a>>() { unimplemented!() }
|
|
|
|
// #740
|
|
struct Test {
|
|
vec: Vec<usize>,
|
|
}
|
|
|
|
impl Test {
|
|
fn iter<'a>(&'a self) -> Box<Iterator<Item = usize> + 'a> {
|
|
unimplemented!()
|
|
}
|
|
}
|
|
|
|
|
|
trait LintContext<'a> {}
|
|
|
|
fn f<'a, T: LintContext<'a>>(_: &T) {}
|
|
|
|
fn test<'a>(x: &'a [u8]) -> u8 {
|
|
let y: &'a u8 = &x[5];
|
|
*y
|
|
}
|
|
|
|
fn main() {
|
|
}
|