diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/single-use-lifetime/one-use-in-fn-argument.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/single-use-lifetime/one-use-in-fn-argument.rs')
-rw-r--r-- | tests/ui/single-use-lifetime/one-use-in-fn-argument.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tests/ui/single-use-lifetime/one-use-in-fn-argument.rs b/tests/ui/single-use-lifetime/one-use-in-fn-argument.rs new file mode 100644 index 000000000..7919ef820 --- /dev/null +++ b/tests/ui/single-use-lifetime/one-use-in-fn-argument.rs @@ -0,0 +1,33 @@ +#![deny(single_use_lifetimes)] +#![allow(dead_code)] +#![allow(unused_variables)] + +// Test that we DO warn when lifetime name is used only +// once in a fn argument. + +fn a<'a>(x: &'a u32) { //~ ERROR `'a` only used once + //~^ HELP elide the single-use lifetime +} + +struct Single<'a> { x: &'a u32 } +struct Double<'a, 'b> { f: &'a &'b u32 } + +fn center<'m>(_: Single<'m>) {} //~ ERROR `'m` only used once +//~^ HELP elide the single-use lifetime +fn left<'x, 'y>(foo: Double<'x, 'y>) -> &'x u32 { foo.f } //~ ERROR `'y` only used once +//~^ HELP elide the single-use lifetime +fn right<'x, 'y>(foo: Double<'x, 'y>) -> &'y u32 { foo.f } //~ ERROR `'x` only used once +//~^ HELP elide the single-use lifetime + +pub trait Tfv<'a> {} + +// Do NOT lint in an HRTB. +pub fn g<T: for<'a> Tfv<'a>>() {} + +// Do NOT lint for trait bounds. +pub fn h<'a, S>(_: S) +where + S: Tfv<'a>, +{} + +fn main() {} |