Finds nested match expressions where the patterns may be combined to reduce the number of branches.
Apply with the Grit CLI
grit apply collapsible_match
Combines nested match
BEFORE
fn func(opt: Option<Result<u64, String>>) {
let n = match opt {
Some(n) => match n {
Ok(n) => n,
Err => return,
}
None => return,
};
}AFTER
fn func(opt: Option<Result<u64, String>>) {
let n = match opt {
Some(Ok(n)) => n,
_ => return,
};
}Does not combine arms with different expressions
RUST
fn func(opt: Option<Result<u64, String>>) {
let n = match opt {
Some(n) => match n {
Ok(n) => n,
Err => 5,
}
None => return,
};
}