111 lines
3.8 KiB
Rust
Executable File
111 lines
3.8 KiB
Rust
Executable File
#![feature(plugin)]
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#![plugin(clippy)]
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#![deny(needless_lifetimes)]
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#![allow(dead_code)]
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fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) { }
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//~^ERROR explicit lifetimes given
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fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) { }
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//~^ERROR explicit lifetimes given
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fn same_lifetime_on_input<'a>(_x: &'a u8, _y: &'a u8) { } // no error, same lifetime on two params
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fn only_static_on_input(_x: &u8, _y: &u8, _z: &'static u8) { } // no error, static involved
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fn mut_and_static_input(_x: &mut u8, _y: &'static str) { }
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fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 { x }
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//~^ERROR explicit lifetimes given
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fn multiple_in_and_out_1<'a>(x: &'a u8, _y: &'a u8) -> &'a u8 { x } // no error, multiple input refs
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fn multiple_in_and_out_2<'a, 'b>(x: &'a u8, _y: &'b u8) -> &'a u8 { x } // no error, multiple input refs
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fn in_static_and_out<'a>(x: &'a u8, _y: &'static u8) -> &'a u8 { x } // no error, static involved
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fn deep_reference_1<'a, 'b>(x: &'a u8, _y: &'b u8) -> Result<&'a u8, ()> { Ok(x) } // no error
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fn deep_reference_2<'a>(x: Result<&'a u8, &'a u8>) -> &'a u8 { x.unwrap() } // no error, two input refs
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fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> { Ok(x) }
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//~^ERROR explicit lifetimes given
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// where clause, but without lifetimes
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fn where_clause_without_lt<'a, T>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> where T: Copy { Ok(x) }
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//~^ERROR explicit lifetimes given
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type Ref<'r> = &'r u8;
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fn lifetime_param_1<'a>(_x: Ref<'a>, _y: &'a u8) { } // no error, same lifetime on two params
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fn lifetime_param_2<'a, 'b>(_x: Ref<'a>, _y: &'b u8) { }
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//~^ERROR explicit lifetimes given
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fn lifetime_param_3<'a, 'b: 'a>(_x: Ref<'a>, _y: &'b u8) { } // no error, bounded lifetime
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fn lifetime_param_4<'a, 'b>(_x: Ref<'a>, _y: &'b u8) where 'b: 'a { } // no error, bounded lifetime
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struct Lt<'a, I: 'static> {
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x: &'a I
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}
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fn fn_bound<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
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where F: Fn(Lt<'a, I>) -> Lt<'a, I> // no error, fn bound references 'a
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{ unreachable!() }
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fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I> //~ERROR explicit lifetimes given
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where for<'x> F: Fn(Lt<'x, I>) -> Lt<'x, I>
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{ unreachable!() }
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struct X {
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x: u8,
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}
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impl X {
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fn self_and_out<'s>(&'s self) -> &'s u8 { &self.x }
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//~^ERROR explicit lifetimes given
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fn self_and_in_out<'s, 't>(&'s self, _x: &'t u8) -> &'s u8 { &self.x } // no error, multiple input refs
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fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) { }
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//~^ERROR explicit lifetimes given
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fn self_and_same_in<'s>(&'s self, _x: &'s u8) { } // no error, same lifetimes on two params
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}
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struct Foo<'a>(&'a u8);
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impl<'a> Foo<'a> {
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fn self_shared_lifetime(&self, _: &'a u8) {} // no error, lifetime 'a not defined in method
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fn self_bound_lifetime<'b: 'a>(&self, _: &'b u8) {} // no error, bounds exist
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}
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fn already_elided<'a>(_: &u8, _: &'a u8) -> &'a u8 {
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unimplemented!()
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}
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fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str { unimplemented!() } //~ERROR explicit lifetimes given
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// no warning, two input lifetimes (named on the reference, anonymous on Foo)
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fn struct_with_lt2<'a>(_foo: &'a Foo) -> &'a str { unimplemented!() }
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// no warning, two input lifetimes (anonymous on the reference, named on Foo)
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fn struct_with_lt3<'a>(_foo: &Foo<'a> ) -> &'a str { unimplemented!() }
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// no warning, two input lifetimes
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fn struct_with_lt4<'a, 'b>(_foo: &'a Foo<'b> ) -> &'a str { unimplemented!() }
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trait WithLifetime<'a> {}
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type WithLifetimeAlias<'a> = WithLifetime<'a>;
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// should not warn because it won't build without the lifetime
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fn trait_obj_elided<'a>(_arg: &'a WithLifetime) -> &'a str { unimplemented!() }
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// this should warn because there is no lifetime on Drop, so this would be
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// unambiguous if we elided the lifetime
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fn trait_obj_elided2<'a>(_arg: &'a Drop) -> &'a str { unimplemented!() } //~ERROR explicit lifetimes given
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fn main() {
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}
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