4 #![deny(needless_lifetimes)]
6 fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) { }
7 //~^ERROR explicit lifetimes given
9 fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) { }
10 //~^ERROR explicit lifetimes given
12 fn same_lifetime_on_input<'a>(_x: &'a u8, _y: &'a u8) { } // no error, same lifetime on two params
14 fn only_static_on_input(_x: &u8, _y: &u8, _z: &'static u8) { } // no error, static involved
16 fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 { x }
17 //~^ERROR explicit lifetimes given
19 fn multiple_in_and_out_1<'a>(x: &'a u8, _y: &'a u8) -> &'a u8 { x } // no error, multiple input refs
21 fn multiple_in_and_out_2<'a, 'b>(x: &'a u8, _y: &'b u8) -> &'a u8 { x } // no error, multiple input refs
23 fn in_static_and_out<'a>(x: &'a u8, _y: &'static u8) -> &'a u8 { x } // no error, static involved
25 fn deep_reference_1<'a, 'b>(x: &'a u8, _y: &'b u8) -> Result<&'a u8, ()> { Ok(x) } // no error
27 fn deep_reference_2<'a>(x: Result<&'a u8, &'a u8>) -> &'a u8 { x.unwrap() } // no error, two input refs
29 fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> { Ok(x) }
30 //~^ERROR explicit lifetimes given
32 type Ref<'r> = &'r u8;
34 fn lifetime_param_1<'a>(_x: Ref<'a>, _y: &'a u8) { }
36 fn lifetime_param_2<'a, 'b: 'a>(_x: Ref<'a>, _y: &'b u8) { }
37 //~^ERROR explicit lifetimes given
44 fn self_and_out<'s>(&'s self) -> &'s u8 { &self.x }
45 //~^ERROR explicit lifetimes given
47 fn self_and_in_out<'s, 't>(&'s self, _x: &'t u8) -> &'s u8 { &self.x } // no error, multiple input refs
49 fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) { }
50 //~^ERROR explicit lifetimes given
52 fn self_and_same_in<'s>(&'s self, _x: &'s u8) { } // no error, same lifetimes on two params
55 static STATIC: u8 = 1;
58 distinct_lifetimes(&1, &2, 3);
59 distinct_and_static(&1, &2, &STATIC);
60 same_lifetime_on_input(&1, &2);
61 only_static_on_input(&1, &2, &STATIC);
63 multiple_in_and_out_1(&1, &2);
64 multiple_in_and_out_2(&1, &2);
65 in_static_and_out(&1, &STATIC);
66 let _ = deep_reference_1(&1, &2);
67 let _ = deep_reference_2(Ok(&1));
68 let _ = deep_reference_3(&1, 2);
69 lifetime_param_1(&1, &2);
70 lifetime_param_2(&1, &2);
74 foo.self_and_in_out(&1);
75 foo.distinct_self_and_in(&1);
76 foo.self_and_same_in(&1);