53 lines
1.4 KiB
Rust
53 lines
1.4 KiB
Rust
#![warn(clippy::collapsible_match)]
|
|
#![allow(clippy::needless_return, clippy::no_effect, clippy::single_match)]
|
|
|
|
fn lint_cases(opt_opt: Option<Option<u32>>, res_opt: Result<Option<u32>, String>) {
|
|
// if guards on outer match
|
|
{
|
|
match res_opt {
|
|
Ok(val) if make() => match val {
|
|
Some(n) => foo(n),
|
|
_ => return,
|
|
},
|
|
_ => return,
|
|
}
|
|
match res_opt {
|
|
Ok(val) => match val {
|
|
Some(n) => foo(n),
|
|
_ => return,
|
|
},
|
|
_ if make() => return,
|
|
_ => return,
|
|
}
|
|
}
|
|
|
|
// macro
|
|
{
|
|
macro_rules! mac {
|
|
($outer:expr => $pat:pat, $e:expr => $inner_pat:pat, $then:expr) => {
|
|
match $outer {
|
|
$pat => match $e {
|
|
$inner_pat => $then,
|
|
_ => return,
|
|
},
|
|
_ => return,
|
|
}
|
|
};
|
|
}
|
|
// Lint this since the patterns are not defined by the macro.
|
|
// Allows the lint to work on if_chain! for example.
|
|
// Fixing the lint requires knowledge of the specific macro, but we optimistically assume that
|
|
// there is still a better way to write this.
|
|
mac!(res_opt => Ok(val), val => Some(n), foo(n));
|
|
}
|
|
}
|
|
|
|
fn make<T>() -> T {
|
|
unimplemented!()
|
|
}
|
|
|
|
fn foo<T, U>(t: T) -> U {
|
|
unimplemented!()
|
|
}
|
|
|
|
fn main() {}
|