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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
commit | a4b7ed7a42c716ab9f05e351f003d589124fd55d (patch) | |
tree | b620cd3f223850b28716e474e80c58059dca5dd4 /tests/ui/lint/unused/must_use-trait.rs | |
parent | Adding upstream version 1.67.1+dfsg1. (diff) | |
download | rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.tar.xz rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.zip |
Adding upstream version 1.68.2+dfsg1.upstream/1.68.2+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/lint/unused/must_use-trait.rs')
-rw-r--r-- | tests/ui/lint/unused/must_use-trait.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tests/ui/lint/unused/must_use-trait.rs b/tests/ui/lint/unused/must_use-trait.rs new file mode 100644 index 000000000..0aa751443 --- /dev/null +++ b/tests/ui/lint/unused/must_use-trait.rs @@ -0,0 +1,39 @@ +#![deny(unused_must_use)] + +#[must_use] +trait Critical {} + +trait NotSoCritical {} + +trait DecidedlyUnimportant {} + +struct Anon; + +impl Critical for Anon {} +impl NotSoCritical for Anon {} +impl DecidedlyUnimportant for Anon {} + +fn get_critical() -> impl NotSoCritical + Critical + DecidedlyUnimportant { + Anon {} +} + +fn get_boxed_critical() -> Box<dyn Critical> { + Box::new(Anon {}) +} + +fn get_nested_boxed_critical() -> Box<Box<dyn Critical>> { + Box::new(Box::new(Anon {})) +} + +fn get_critical_tuple() -> (u32, Box<dyn Critical>, impl Critical, ()) { + (0, get_boxed_critical(), get_critical(), ()) +} + +fn main() { + get_critical(); //~ ERROR unused implementer of `Critical` that must be used + get_boxed_critical(); //~ ERROR unused boxed `Critical` trait object that must be used + get_nested_boxed_critical(); + //~^ ERROR unused boxed boxed `Critical` trait object that must be used + get_critical_tuple(); //~ ERROR unused boxed `Critical` trait object in tuple element 1 + //~^ ERROR unused implementer of `Critical` in tuple element 2 +} |