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Do not lint when range is completely included into another one #6603

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Jan 31, 2021
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Do not lint when range is completely included into another one #6603

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Do not lint when range is completely included into another one
ThibsG Jan 15, 2021
0518911
Add more tests for `match_overlapping_arm` lint
ThibsG Jan 24, 2021
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18 changes: 18 additions & 0 deletions tests/ui/match_overlapping_arm.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,24 @@ fn overlapping() {
_ => (),
}
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match 42 {
0..14 => println!("0 .. 14"),
5..10 => println!("5 .. 10"),
_ => (),
}
Comment on lines +72 to +76
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Huh, shouldn't rustc trigger here? the second arm is unreachable. Well, at least this lint doesn't trigger here.

A quick check on Playground shows that rustc triggers here correctly. So I assume this is a late pass lint in rustc and therefore would only trigger once the clippy lint doesn't trigger anymore.

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Yes I was a bit surprise too, I was also waiting for an unreachable warning 😅


match 42 {
5..14 => println!("5 .. 14"),
0..=10 => println!("0 ... 10"),
_ => (),
}

match 42 {
0..7 => println!("0 .. 7"),
0..=10 => println!("0 ... 10"),
_ => (),
}

/*
// FIXME(JohnTitor): uncomment this once rustfmt knows half-open patterns
match 42 {
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26 changes: 25 additions & 1 deletion tests/ui/match_overlapping_arm.stderr
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Expand Up @@ -35,5 +35,29 @@ note: overlaps with this
LL | 0..=11 => println!("0 ... 11"),
| ^^^^^^

error: aborting due to 3 previous errors
error: some ranges overlap
--> $DIR/match_overlapping_arm.rs:80:9
|
LL | 0..=10 => println!("0 ... 10"),
| ^^^^^^
|
note: overlaps with this
--> $DIR/match_overlapping_arm.rs:79:9
|
LL | 5..14 => println!("5 .. 14"),
| ^^^^^

error: some ranges overlap
--> $DIR/match_overlapping_arm.rs:85:9
|
LL | 0..7 => println!("0 .. 7"),
| ^^^^
|
note: overlaps with this
--> $DIR/match_overlapping_arm.rs:86:9
|
LL | 0..=10 => println!("0 ... 10"),
| ^^^^^^

error: aborting due to 5 previous errors