diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/redundant_pattern_matching_option.rs')
-rw-r--r-- | src/tools/clippy/tests/ui/redundant_pattern_matching_option.rs | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/redundant_pattern_matching_option.rs b/src/tools/clippy/tests/ui/redundant_pattern_matching_option.rs new file mode 100644 index 000000000..d6f444034 --- /dev/null +++ b/src/tools/clippy/tests/ui/redundant_pattern_matching_option.rs @@ -0,0 +1,103 @@ +// run-rustfix + +#![warn(clippy::all)] +#![warn(clippy::redundant_pattern_matching)] +#![allow( + unused_must_use, + clippy::needless_bool, + clippy::match_like_matches_macro, + clippy::equatable_if_let, + clippy::if_same_then_else +)] + +fn main() { + if let None = None::<()> {} + + if let Some(_) = Some(42) {} + + if let Some(_) = Some(42) { + foo(); + } else { + bar(); + } + + while let Some(_) = Some(42) {} + + while let None = Some(42) {} + + while let None = None::<()> {} + + let mut v = vec![1, 2, 3]; + while let Some(_) = v.pop() { + foo(); + } + + if None::<i32>.is_none() {} + + if Some(42).is_some() {} + + match Some(42) { + Some(_) => true, + None => false, + }; + + match None::<()> { + Some(_) => false, + None => true, + }; + + let _ = match None::<()> { + Some(_) => false, + None => true, + }; + + let opt = Some(false); + let _ = if let Some(_) = opt { true } else { false }; + + issue6067(); + + let _ = if let Some(_) = gen_opt() { + 1 + } else if let None = gen_opt() { + 2 + } else { + 3 + }; +} + +fn gen_opt() -> Option<()> { + None +} + +fn foo() {} + +fn bar() {} + +// Methods that are unstable const should not be suggested within a const context, see issue #5697. +// However, in Rust 1.48.0 the methods `is_some` and `is_none` of `Option` were stabilized as const, +// so the following should be linted. +const fn issue6067() { + if let Some(_) = Some(42) {} + + if let None = None::<()> {} + + while let Some(_) = Some(42) {} + + while let None = None::<()> {} + + match Some(42) { + Some(_) => true, + None => false, + }; + + match None::<()> { + Some(_) => false, + None => true, + }; +} + +#[allow(clippy::deref_addrof, dead_code, clippy::needless_borrow)] +fn issue7921() { + if let None = *(&None::<()>) {} + if let None = *&None::<()> {} +} |