81 lines
2.5 KiB
Rust
Executable File
81 lines
2.5 KiB
Rust
Executable File
#![feature(plugin)]
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#![plugin(clippy)]
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#![deny(needless_lifetimes)]
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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 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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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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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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static STATIC: u8 = 1;
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fn main() {
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distinct_lifetimes(&1, &2, 3);
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distinct_and_static(&1, &2, &STATIC);
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same_lifetime_on_input(&1, &2);
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only_static_on_input(&1, &2, &STATIC);
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in_and_out(&1, 2);
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multiple_in_and_out_1(&1, &2);
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multiple_in_and_out_2(&1, &2);
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in_static_and_out(&1, &STATIC);
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let _ = deep_reference_1(&1, &2);
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let _ = deep_reference_2(Ok(&1));
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let _ = deep_reference_3(&1, 2);
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lifetime_param_1(&1, &2);
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lifetime_param_2(&1, &2);
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lifetime_param_3(&1, &2);
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let foo = X { x: 1 };
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foo.self_and_out();
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foo.self_and_in_out(&1);
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foo.distinct_self_and_in(&1);
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foo.self_and_same_in(&1);
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}
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