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joined_uncovered_patterns: use slice pats & eta-reduce.

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This commit is contained in:
Mazdak Farrokhzad 2019-09-09 02:05:54 +02:00
parent 5435b38456
commit b36a206a30
1 changed files with 6 additions and 7 deletions
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13
src/librustc_mir/hair/pattern/check_match.rs
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@ -489,17 +489,16 @@ fn check_exhaustive<'tcx>(
fn joined_uncovered_patterns(witnesses: &[&Pattern<'_>]) -> String {
const LIMIT: usize = 3;
match witnesses.len() {
0 => bug!(),
1 => format!("`{}`", witnesses[0]),
2..=LIMIT => {
let (tail, head) = witnesses.split_last().unwrap();
let head: Vec<_> = head.iter().map(|w| w.to_string()).collect();
match witnesses {
[] => bug!(),
[witness] => format!("`{}`", witness),
[head @ .., tail] if head.len() < LIMIT => {
let head: Vec<_> = head.iter().map(<_>::to_string).collect();
format!("`{}` and `{}`", head.join("`, `"), tail)
}
_ => {
let (head, tail) = witnesses.split_at(LIMIT);
let head: Vec<_> = head.iter().map(|w| w.to_string()).collect();
let head: Vec<_> = head.iter().map(<_>::to_string).collect();
format!("`{}` and {} more", head.join("`, `"), tail.len())
}
}