diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/mem_replace.rs')
-rw-r--r-- | src/tools/clippy/tests/ui/mem_replace.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/mem_replace.rs b/src/tools/clippy/tests/ui/mem_replace.rs index f4f3bff51..fa2903add 100644 --- a/src/tools/clippy/tests/ui/mem_replace.rs +++ b/src/tools/clippy/tests/ui/mem_replace.rs @@ -90,3 +90,37 @@ fn msrv_1_40() { let mut s = String::from("foo"); let _ = std::mem::replace(&mut s, String::default()); } + +fn issue9824() { + struct Foo<'a>(Option<&'a str>); + impl<'a> std::ops::Deref for Foo<'a> { + type Target = Option<&'a str>; + + fn deref(&self) -> &Self::Target { + &self.0 + } + } + impl<'a> std::ops::DerefMut for Foo<'a> { + fn deref_mut(&mut self) -> &mut Self::Target { + &mut self.0 + } + } + + struct Bar { + opt: Option<u8>, + val: String, + } + + let mut f = Foo(Some("foo")); + let mut b = Bar { + opt: Some(1), + val: String::from("bar"), + }; + + // replace option with none + let _ = std::mem::replace(&mut f.0, None); + let _ = std::mem::replace(&mut *f, None); + let _ = std::mem::replace(&mut b.opt, None); + // replace with default + let _ = std::mem::replace(&mut b.val, String::default()); +} |