2023-01-31 08:12:03 -06:00
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// run-rustfix
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2023-01-30 17:04:19 -06:00
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// aux-build:macro_rules.rs
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2023-01-31 08:12:03 -06:00
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2019-05-20 12:19:49 -05:00
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#![warn(clippy::needless_lifetimes)]
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2022-01-14 08:24:25 -06:00
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#![allow(
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2023-01-31 08:12:03 -06:00
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unused,
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2022-01-14 08:24:25 -06:00
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clippy::boxed_local,
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2023-02-02 18:36:42 -06:00
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clippy::extra_unused_type_parameters,
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2022-01-14 08:24:25 -06:00
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clippy::needless_pass_by_value,
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clippy::unnecessary_wraps,
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2022-05-24 04:56:37 -05:00
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dyn_drop,
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clippy::get_first
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2022-01-14 08:24:25 -06:00
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)]
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2016-01-29 15:18:14 -06:00
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2023-01-30 17:04:19 -06:00
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#[macro_use]
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extern crate macro_rules;
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2018-12-09 16:26:16 -06:00
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fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) {}
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2017-02-08 07:58:07 -06:00
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2018-12-09 16:26:16 -06:00
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fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) {}
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2017-02-08 07:58:07 -06:00
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2019-01-30 19:15:29 -06:00
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// No error; same lifetime on two params.
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fn same_lifetime_on_input<'a>(_x: &'a u8, _y: &'a u8) {}
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2015-08-12 06:16:09 -05:00
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2019-01-30 19:15:29 -06:00
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// No error; static involved.
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fn only_static_on_input(_x: &u8, _y: &u8, _z: &'static u8) {}
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2015-08-12 06:16:09 -05:00
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2018-12-09 16:26:16 -06:00
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fn mut_and_static_input(_x: &mut u8, _y: &'static str) {}
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2015-08-15 02:36:02 -05:00
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2018-12-09 16:26:16 -06:00
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fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 {
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x
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}
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2017-02-08 07:58:07 -06:00
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2019-01-30 19:15:29 -06:00
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// No error; multiple input refs.
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2018-12-09 16:26:16 -06:00
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fn multiple_in_and_out_1<'a>(x: &'a u8, _y: &'a u8) -> &'a u8 {
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x
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2019-01-30 19:15:29 -06:00
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}
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2015-08-12 06:16:09 -05:00
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2022-10-30 05:47:35 -05:00
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// Error; multiple input refs, but the output lifetime is not elided, i.e., the following is valid:
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// fn multiple_in_and_out_2a<'a>(x: &'a u8, _y: &u8) -> &'a u8
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// ^^^
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fn multiple_in_and_out_2a<'a, 'b>(x: &'a u8, _y: &'b u8) -> &'a u8 {
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2018-12-09 16:26:16 -06:00
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x
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}
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2015-08-12 06:16:09 -05:00
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2022-10-30 05:47:35 -05:00
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// Error; multiple input refs, but the output lifetime is not elided, i.e., the following is valid:
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// fn multiple_in_and_out_2b<'b>(_x: &u8, y: &'b u8) -> &'b u8
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// ^^^
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fn multiple_in_and_out_2b<'a, 'b>(_x: &'a u8, y: &'b u8) -> &'b u8 {
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y
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}
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2021-10-30 05:11:45 -05:00
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// No error; multiple input refs
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async fn func<'a>(args: &[&'a str]) -> Option<&'a str> {
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args.get(0).cloned()
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}
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2019-01-30 19:15:29 -06:00
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// No error; static involved.
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2018-12-09 16:26:16 -06:00
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fn in_static_and_out<'a>(x: &'a u8, _y: &'static u8) -> &'a u8 {
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x
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}
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2015-08-12 06:16:09 -05:00
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2022-10-30 05:47:35 -05:00
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// Error; multiple input refs, but the output lifetime is not elided, i.e., the following is valid:
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// fn deep_reference_1a<'a>(x: &'a u8, _y: &u8) -> Result<&'a u8, ()>
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// ^^^
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fn deep_reference_1a<'a, 'b>(x: &'a u8, _y: &'b u8) -> Result<&'a u8, ()> {
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Ok(x)
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}
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2015-08-12 06:16:09 -05:00
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2022-10-30 05:47:35 -05:00
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// Error; multiple input refs, but the output lifetime is not elided, i.e., the following is valid:
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// fn deep_reference_1b<'b>(_x: &u8, y: &'b u8) -> Result<&'b u8, ()>
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// ^^^
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fn deep_reference_1b<'a, 'b>(_x: &'a u8, y: &'b u8) -> Result<&'b u8, ()> {
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Ok(y)
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}
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2019-01-30 19:15:29 -06:00
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// No error; two input refs.
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2018-12-09 16:26:16 -06:00
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fn deep_reference_2<'a>(x: Result<&'a u8, &'a u8>) -> &'a u8 {
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x.unwrap()
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2019-01-30 19:15:29 -06:00
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}
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2015-08-12 06:16:09 -05:00
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2018-12-09 16:26:16 -06:00
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fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> {
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Ok(x)
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}
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2017-02-08 07:58:07 -06:00
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2019-01-30 19:15:29 -06:00
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// Where-clause, but without lifetimes.
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2018-12-09 16:26:16 -06:00
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fn where_clause_without_lt<'a, T>(x: &'a u8, _y: u8) -> Result<&'a u8, ()>
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where
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T: Copy,
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{
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Ok(x)
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}
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2017-02-08 07:58:07 -06:00
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2015-08-12 23:43:25 -05:00
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type Ref<'r> = &'r u8;
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2019-01-30 19:15:29 -06:00
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// No error; same lifetime on two params.
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fn lifetime_param_1<'a>(_x: Ref<'a>, _y: &'a u8) {}
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2015-08-12 23:43:25 -05:00
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2018-12-09 16:26:16 -06:00
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fn lifetime_param_2<'a, 'b>(_x: Ref<'a>, _y: &'b u8) {}
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2017-02-08 07:58:07 -06:00
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2019-01-30 19:15:29 -06:00
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// No error; bounded lifetime.
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fn lifetime_param_3<'a, 'b: 'a>(_x: Ref<'a>, _y: &'b u8) {}
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2015-08-13 10:24:47 -05:00
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2019-01-30 19:15:29 -06:00
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// No error; bounded lifetime.
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2018-12-09 16:26:16 -06:00
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fn lifetime_param_4<'a, 'b>(_x: Ref<'a>, _y: &'b u8)
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where
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'b: 'a,
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{
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2019-01-30 19:15:29 -06:00
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}
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2015-08-30 02:57:52 -05:00
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2015-08-31 04:11:51 -05:00
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struct Lt<'a, I: 'static> {
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2018-12-09 16:26:16 -06:00
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x: &'a I,
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2015-08-31 04:11:51 -05:00
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}
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2019-01-30 19:15:29 -06:00
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// No error; fn bound references `'a`.
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2015-08-31 04:11:51 -05:00
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fn fn_bound<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
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where
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2019-01-30 19:15:29 -06:00
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F: Fn(Lt<'a, I>) -> Lt<'a, I>,
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2018-12-09 16:26:16 -06:00
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{
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unreachable!()
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}
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2015-08-31 04:11:51 -05:00
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2017-02-08 07:58:07 -06:00
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fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
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2018-12-09 16:26:16 -06:00
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where
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for<'x> F: Fn(Lt<'x, I>) -> Lt<'x, I>,
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{
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unreachable!()
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}
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2015-08-31 04:11:51 -05:00
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2019-01-30 19:15:29 -06:00
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// No error; see below.
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2018-12-09 16:26:16 -06:00
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fn fn_bound_3<'a, F: FnOnce(&'a i32)>(x: &'a i32, f: F) {
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2018-06-19 10:12:17 -05:00
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f(x);
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}
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fn fn_bound_3_cannot_elide() {
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let x = 42;
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let p = &x;
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let mut q = &x;
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2019-01-30 19:15:29 -06:00
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// This will fail if we elide lifetimes of `fn_bound_3`.
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fn_bound_3(p, |y| q = y);
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2018-06-19 10:12:17 -05:00
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}
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2018-06-19 08:25:38 -05:00
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2019-01-30 19:15:29 -06:00
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// No error; multiple input refs.
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2018-06-19 10:12:17 -05:00
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fn fn_bound_4<'a, F: FnOnce() -> &'a ()>(cond: bool, x: &'a (), f: F) -> &'a () {
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2021-03-12 08:30:50 -06:00
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if cond { x } else { f() }
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2018-06-19 10:12:17 -05:00
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}
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2018-06-19 08:25:38 -05:00
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2015-08-12 06:16:09 -05:00
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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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2018-12-09 16:26:16 -06:00
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fn self_and_out<'s>(&'s self) -> &'s u8 {
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&self.x
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}
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2017-02-08 07:58:07 -06:00
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2022-10-30 05:47:35 -05:00
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// Error; multiple input refs, but the output lifetime is not elided, i.e., the following is valid:
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// fn self_and_in_out_1<'s>(&'s self, _x: &u8) -> &'s u8
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// ^^^
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fn self_and_in_out_1<'s, 't>(&'s self, _x: &'t u8) -> &'s u8 {
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2018-12-09 16:26:16 -06:00
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&self.x
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2019-01-30 19:15:29 -06:00
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}
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2015-08-12 06:16:09 -05:00
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2022-10-30 05:47:35 -05:00
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// Error; multiple input refs, but the output lifetime is not elided, i.e., the following is valid:
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// fn self_and_in_out_2<'t>(&self, x: &'t u8) -> &'t u8
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// ^^^^^
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fn self_and_in_out_2<'s, 't>(&'s self, x: &'t u8) -> &'t u8 {
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x
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}
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2018-12-09 16:26:16 -06:00
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fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) {}
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2017-02-08 07:58:07 -06:00
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2019-01-30 19:15:29 -06:00
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// No error; same lifetimes on two params.
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fn self_and_same_in<'s>(&'s self, _x: &'s u8) {}
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2015-08-12 06:16:09 -05:00
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}
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2015-08-13 10:40:45 -05:00
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struct Foo<'a>(&'a u8);
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impl<'a> Foo<'a> {
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2019-01-30 19:15:29 -06:00
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// No error; lifetime `'a` not defined in method.
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fn self_shared_lifetime(&self, _: &'a u8) {}
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// No error; bounds exist.
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fn self_bound_lifetime<'b: 'a>(&self, _: &'b u8) {}
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2015-08-13 10:40:45 -05:00
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}
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2015-08-12 06:16:09 -05:00
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2015-09-30 09:40:54 -05:00
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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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2018-12-09 16:26:16 -06:00
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fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str {
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unimplemented!()
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}
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2015-11-10 17:26:22 -06:00
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2019-01-30 19:15:29 -06:00
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// No warning; two input lifetimes (named on the reference, anonymous on `Foo`).
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2018-12-09 16:26:16 -06:00
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fn struct_with_lt2<'a>(_foo: &'a Foo) -> &'a str {
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unimplemented!()
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}
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2015-11-10 17:26:22 -06:00
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2019-01-30 19:15:29 -06:00
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// No warning; two input lifetimes (anonymous on the reference, named on `Foo`).
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2018-12-09 16:26:16 -06:00
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fn struct_with_lt3<'a>(_foo: &Foo<'a>) -> &'a str {
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unimplemented!()
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}
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2015-11-10 17:26:22 -06:00
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2022-10-30 05:47:35 -05:00
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// Warning; two input lifetimes, but the output lifetime is not elided, i.e., the following is
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// valid:
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// fn struct_with_lt4a<'a>(_foo: &'a Foo<'_>) -> &'a str
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// ^^
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fn struct_with_lt4a<'a, 'b>(_foo: &'a Foo<'b>) -> &'a str {
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unimplemented!()
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}
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// Warning; two input lifetimes, but the output lifetime is not elided, i.e., the following is
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// valid:
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// fn struct_with_lt4b<'b>(_foo: &Foo<'b>) -> &'b str
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// ^^^^
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fn struct_with_lt4b<'a, 'b>(_foo: &'a Foo<'b>) -> &'b str {
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2018-12-09 16:26:16 -06:00
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unimplemented!()
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}
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2015-11-10 17:26:22 -06:00
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trait WithLifetime<'a> {}
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2016-01-29 15:18:14 -06:00
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2019-05-30 01:23:47 -05:00
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type WithLifetimeAlias<'a> = dyn WithLifetime<'a>;
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2015-11-10 17:26:22 -06:00
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2019-01-30 19:15:29 -06:00
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// Should not warn because it won't build without the lifetime.
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2019-05-30 01:23:47 -05:00
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fn trait_obj_elided<'a>(_arg: &'a dyn WithLifetime) -> &'a str {
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2018-12-09 16:26:16 -06:00
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unimplemented!()
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}
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2015-11-10 17:26:22 -06:00
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2019-01-30 19:15:29 -06:00
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// 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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2019-05-30 01:23:47 -05:00
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fn trait_obj_elided2<'a>(_arg: &'a dyn Drop) -> &'a str {
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2018-12-09 16:26:16 -06:00
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unimplemented!()
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}
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2015-11-10 17:26:22 -06:00
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2015-12-04 08:56:25 -06:00
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type FooAlias<'a> = Foo<'a>;
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2018-12-09 16:26:16 -06:00
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fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str {
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unimplemented!()
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}
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2015-12-04 08:56:25 -06:00
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2019-01-30 19:15:29 -06:00
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// No warning; two input lifetimes (named on the reference, anonymous on `FooAlias`).
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2018-12-09 16:26:16 -06:00
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fn alias_with_lt2<'a>(_foo: &'a FooAlias) -> &'a str {
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unimplemented!()
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}
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2015-12-04 08:56:25 -06:00
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2019-01-30 19:15:29 -06:00
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// No warning; two input lifetimes (anonymous on the reference, named on `FooAlias`).
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2018-12-09 16:26:16 -06:00
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fn alias_with_lt3<'a>(_foo: &FooAlias<'a>) -> &'a str {
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unimplemented!()
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}
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2015-12-04 08:56:25 -06:00
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|
2022-10-30 05:47:35 -05:00
|
|
|
// Warning; two input lifetimes, but the output lifetime is not elided, i.e., the following is
|
|
|
|
// valid:
|
|
|
|
// fn alias_with_lt4a<'a>(_foo: &'a FooAlias<'_>) -> &'a str
|
|
|
|
// ^^
|
|
|
|
fn alias_with_lt4a<'a, 'b>(_foo: &'a FooAlias<'b>) -> &'a str {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
|
|
|
|
// Warning; two input lifetimes, but the output lifetime is not elided, i.e., the following is
|
|
|
|
// valid:
|
|
|
|
// fn alias_with_lt4b<'b>(_foo: &FooAlias<'b>) -> &'b str
|
|
|
|
// ^^^^^^^^^
|
|
|
|
fn alias_with_lt4b<'a, 'b>(_foo: &'a FooAlias<'b>) -> &'b str {
|
2018-12-09 16:26:16 -06:00
|
|
|
unimplemented!()
|
|
|
|
}
|
2015-12-04 08:56:25 -06:00
|
|
|
|
2018-12-09 16:26:16 -06:00
|
|
|
fn named_input_elided_output<'a>(_arg: &'a str) -> &str {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
2016-01-17 10:53:41 -06:00
|
|
|
|
2018-12-09 16:26:16 -06:00
|
|
|
fn elided_input_named_output<'a>(_arg: &str) -> &'a str {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
2016-01-17 10:53:41 -06:00
|
|
|
|
2018-12-09 16:26:16 -06:00
|
|
|
fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
fn trait_bound<'a, T: WithLifetime<'a>>(_: &'a u8, _: T) {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
2016-01-29 15:18:14 -06:00
|
|
|
|
2019-01-30 19:15:29 -06:00
|
|
|
// Don't warn on these; see issue #292.
|
2018-12-09 16:26:16 -06:00
|
|
|
fn trait_bound_bug<'a, T: WithLifetime<'a>>() {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
2017-04-11 07:09:58 -05:00
|
|
|
|
2019-01-30 19:15:29 -06:00
|
|
|
// See issue #740.
|
2017-04-11 07:09:58 -05:00
|
|
|
struct Test {
|
|
|
|
vec: Vec<usize>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Test {
|
2019-05-30 01:23:47 -05:00
|
|
|
fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = usize> + 'a> {
|
2017-04-11 07:09:58 -05:00
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
trait LintContext<'a> {}
|
|
|
|
|
2017-04-11 07:34:39 -05:00
|
|
|
fn f<'a, T: LintContext<'a>>(_: &T) {}
|
2017-04-11 07:09:58 -05:00
|
|
|
|
|
|
|
fn test<'a>(x: &'a [u8]) -> u8 {
|
|
|
|
let y: &'a u8 = &x[5];
|
|
|
|
*y
|
|
|
|
}
|
|
|
|
|
2019-01-30 19:15:29 -06:00
|
|
|
// Issue #3284: give hint regarding lifetime in return type.
|
2018-12-09 16:26:16 -06:00
|
|
|
struct Cow<'a> {
|
|
|
|
x: &'a str,
|
2015-08-12 06:16:09 -05:00
|
|
|
}
|
2018-12-09 16:26:16 -06:00
|
|
|
fn out_return_type_lts<'a>(e: &'a str) -> Cow<'a> {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
|
2019-09-01 01:11:40 -05:00
|
|
|
// Make sure we still warn on implementations
|
|
|
|
mod issue4291 {
|
|
|
|
trait BadTrait {
|
|
|
|
fn needless_lt<'a>(x: &'a u8) {}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl BadTrait for () {
|
|
|
|
fn needless_lt<'a>(_x: &'a u8) {}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-10-09 05:45:29 -05:00
|
|
|
mod issue2944 {
|
|
|
|
trait Foo {}
|
2022-03-27 07:41:09 -05:00
|
|
|
struct Bar;
|
2020-10-09 05:45:29 -05:00
|
|
|
struct Baz<'a> {
|
|
|
|
bar: &'a Bar,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<'a> Foo for Baz<'a> {}
|
|
|
|
impl Bar {
|
|
|
|
fn baz<'a>(&'a self) -> impl Foo + 'a {
|
|
|
|
Baz { bar: self }
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
mod nested_elision_sites {
|
|
|
|
// issue #issue2944
|
|
|
|
|
|
|
|
// closure trait bounds subject to nested elision
|
|
|
|
// don't lint because they refer to outer lifetimes
|
|
|
|
fn trait_fn<'a>(i: &'a i32) -> impl Fn() -> &'a i32 {
|
|
|
|
move || i
|
|
|
|
}
|
|
|
|
fn trait_fn_mut<'a>(i: &'a i32) -> impl FnMut() -> &'a i32 {
|
|
|
|
move || i
|
|
|
|
}
|
|
|
|
fn trait_fn_once<'a>(i: &'a i32) -> impl FnOnce() -> &'a i32 {
|
|
|
|
move || i
|
|
|
|
}
|
|
|
|
|
|
|
|
// don't lint
|
|
|
|
fn impl_trait_in_input_position<'a>(f: impl Fn() -> &'a i32) -> &'a i32 {
|
|
|
|
f()
|
|
|
|
}
|
|
|
|
fn impl_trait_in_output_position<'a>(i: &'a i32) -> impl Fn() -> &'a i32 {
|
|
|
|
move || i
|
|
|
|
}
|
|
|
|
// lint
|
|
|
|
fn impl_trait_elidable_nested_named_lifetimes<'a>(i: &'a i32, f: impl for<'b> Fn(&'b i32) -> &'b i32) -> &'a i32 {
|
|
|
|
f(i)
|
|
|
|
}
|
|
|
|
fn impl_trait_elidable_nested_anonymous_lifetimes<'a>(i: &'a i32, f: impl Fn(&i32) -> &i32) -> &'a i32 {
|
|
|
|
f(i)
|
|
|
|
}
|
|
|
|
|
|
|
|
// don't lint
|
|
|
|
fn generics_not_elidable<'a, T: Fn() -> &'a i32>(f: T) -> &'a i32 {
|
|
|
|
f()
|
|
|
|
}
|
|
|
|
// lint
|
|
|
|
fn generics_elidable<'a, T: Fn(&i32) -> &i32>(i: &'a i32, f: T) -> &'a i32 {
|
|
|
|
f(i)
|
|
|
|
}
|
|
|
|
|
|
|
|
// don't lint
|
|
|
|
fn where_clause_not_elidable<'a, T>(f: T) -> &'a i32
|
|
|
|
where
|
|
|
|
T: Fn() -> &'a i32,
|
|
|
|
{
|
|
|
|
f()
|
|
|
|
}
|
|
|
|
// lint
|
|
|
|
fn where_clause_elidadable<'a, T>(i: &'a i32, f: T) -> &'a i32
|
|
|
|
where
|
|
|
|
T: Fn(&i32) -> &i32,
|
|
|
|
{
|
|
|
|
f(i)
|
|
|
|
}
|
|
|
|
|
|
|
|
// don't lint
|
|
|
|
fn pointer_fn_in_input_position<'a>(f: fn(&'a i32) -> &'a i32, i: &'a i32) -> &'a i32 {
|
|
|
|
f(i)
|
|
|
|
}
|
|
|
|
fn pointer_fn_in_output_position<'a>(_: &'a i32) -> fn(&'a i32) -> &'a i32 {
|
|
|
|
|i| i
|
|
|
|
}
|
|
|
|
// lint
|
|
|
|
fn pointer_fn_elidable<'a>(i: &'a i32, f: fn(&i32) -> &i32) -> &'a i32 {
|
|
|
|
f(i)
|
|
|
|
}
|
|
|
|
|
|
|
|
// don't lint
|
|
|
|
fn nested_fn_pointer_1<'a>(_: &'a i32) -> fn(fn(&'a i32) -> &'a i32) -> i32 {
|
|
|
|
|f| 42
|
|
|
|
}
|
|
|
|
fn nested_fn_pointer_2<'a>(_: &'a i32) -> impl Fn(fn(&'a i32)) {
|
|
|
|
|f| ()
|
|
|
|
}
|
|
|
|
|
|
|
|
// lint
|
|
|
|
fn nested_fn_pointer_3<'a>(_: &'a i32) -> fn(fn(&i32) -> &i32) -> i32 {
|
|
|
|
|f| 42
|
|
|
|
}
|
|
|
|
fn nested_fn_pointer_4<'a>(_: &'a i32) -> impl Fn(fn(&i32)) {
|
|
|
|
|f| ()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-10-28 17:36:07 -05:00
|
|
|
mod issue6159 {
|
|
|
|
use std::ops::Deref;
|
|
|
|
pub fn apply_deref<'a, T, F, R>(x: &'a T, f: F) -> R
|
|
|
|
where
|
|
|
|
T: Deref,
|
|
|
|
F: FnOnce(&'a T::Target) -> R,
|
|
|
|
{
|
|
|
|
f(x.deref())
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-01-14 08:24:25 -06:00
|
|
|
mod issue7296 {
|
|
|
|
use std::rc::Rc;
|
|
|
|
use std::sync::Arc;
|
|
|
|
|
|
|
|
struct Foo;
|
|
|
|
impl Foo {
|
|
|
|
fn implicit<'a>(&'a self) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
fn implicit_mut<'a>(&'a mut self) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
|
|
|
|
fn explicit<'a>(self: &'a Arc<Self>) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
fn explicit_mut<'a>(self: &'a mut Rc<Self>) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
|
|
|
|
fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
trait Bar {
|
|
|
|
fn implicit<'a>(&'a self) -> &'a ();
|
|
|
|
fn implicit_provided<'a>(&'a self) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
|
|
|
|
fn explicit<'a>(self: &'a Arc<Self>) -> &'a ();
|
|
|
|
fn explicit_provided<'a>(self: &'a Arc<Self>) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
|
|
|
|
fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a ();
|
|
|
|
fn lifetime_elsewhere_provided<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
|
|
|
|
&()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-10-30 05:47:35 -05:00
|
|
|
mod pr_9743_false_negative_fix {
|
2022-10-28 12:17:36 -05:00
|
|
|
#![allow(unused)]
|
|
|
|
|
|
|
|
fn foo<'a>(x: &'a u8, y: &'_ u8) {}
|
|
|
|
|
|
|
|
fn bar<'a>(x: &'a u8, y: &'_ u8, z: &'_ u8) {}
|
|
|
|
}
|
|
|
|
|
2022-10-30 05:47:35 -05:00
|
|
|
mod pr_9743_output_lifetime_checks {
|
|
|
|
#![allow(unused)]
|
|
|
|
|
|
|
|
// lint: only one input
|
|
|
|
fn one_input<'a>(x: &'a u8) -> &'a u8 {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
|
|
|
|
// lint: multiple inputs, output would not be elided
|
|
|
|
fn multiple_inputs_output_not_elided<'a, 'b>(x: &'a u8, y: &'b u8, z: &'b u8) -> &'b u8 {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
|
|
|
|
// don't lint: multiple inputs, output would be elided (which would create an ambiguity)
|
|
|
|
fn multiple_inputs_output_would_be_elided<'a, 'b>(x: &'a u8, y: &'b u8, z: &'b u8) -> &'a u8 {
|
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2023-01-30 17:04:19 -06:00
|
|
|
mod in_macro {
|
|
|
|
macro_rules! local_one_input_macro {
|
|
|
|
() => {
|
|
|
|
fn one_input<'a>(x: &'a u8) -> &'a u8 {
|
2023-01-30 08:59:01 -06:00
|
|
|
unimplemented!()
|
|
|
|
}
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
2023-01-30 17:04:19 -06:00
|
|
|
// lint local macro expands to function with needless lifetimes
|
|
|
|
local_one_input_macro!();
|
|
|
|
|
|
|
|
// no lint on external macro
|
|
|
|
macro_rules::needless_lifetime!();
|
2023-02-20 03:47:05 -06:00
|
|
|
|
|
|
|
macro_rules! expanded_lifetime {
|
|
|
|
($l:lifetime) => {
|
|
|
|
fn f<$l>(arg: &$l str) -> &$l str {
|
|
|
|
arg
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
expanded_lifetime!('a);
|
2023-01-30 08:59:01 -06:00
|
|
|
}
|
|
|
|
|
2023-01-31 08:12:03 -06:00
|
|
|
mod issue5787 {
|
|
|
|
use std::sync::MutexGuard;
|
|
|
|
|
|
|
|
struct Foo;
|
|
|
|
|
|
|
|
impl Foo {
|
|
|
|
// doesn't get linted without async
|
|
|
|
pub async fn wait<'a, T>(&self, guard: MutexGuard<'a, T>) -> MutexGuard<'a, T> {
|
|
|
|
guard
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
async fn foo<'a>(_x: &i32, y: &'a str) -> &'a str {
|
|
|
|
y
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-12-09 16:26:16 -06:00
|
|
|
fn main() {}
|