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#![feature(exclusive_range_pattern)]
#![deny(non_contiguous_range_endpoints)]
macro_rules! m {
($s:expr, $t1:pat, $t2:pat) => {
match $s {
$t1 => {}
$t2 => {}
_ => {}
}
};
}
fn main() {
match 0u8 {
20..30 => {} //~ ERROR multiple ranges are one apart
31..=40 => {}
_ => {}
}
match 0u8 {
20..30 => {} //~ ERROR multiple ranges are one apart
31 => {}
_ => {}
}
m!(0u8, 20..30, 31..=40); //~ ERROR multiple ranges are one apart
m!(0u8, 31..=40, 20..30); //~ ERROR multiple ranges are one apart
m!(0u8, 20..30, 29..=40); //~ WARN multiple patterns overlap on their endpoints
m!(0u8, 20..30, 30..=40);
m!(0u8, 20..30, 31..=40); //~ ERROR multiple ranges are one apart
m!(0u8, 20..30, 32..=40);
m!(0u8, 20..30, 31..=32); //~ ERROR multiple ranges are one apart
// Don't lint two singletons.
m!(0u8, 30, 32);
// Don't lint on the equivalent inclusive range
m!(0u8, 20..=29, 31..=40);
// Don't lint if the lower one is a singleton.
m!(0u8, 30, 32..=40);
// Catch the `lo..MAX` case.
match 0u8 {
0..255 => {} //~ ERROR exclusive range missing `u8::MAX`
_ => {}
}
// Except for `usize`, since `0..=usize::MAX` isn't exhaustive either.
match 0usize {
0..usize::MAX => {}
_ => {}
}
// Don't lint if the gap is caught by another range.
match 0u8 {
0..10 => {}
11..20 => {}
10 => {}
_ => {}
}
match 0u8 {
0..10 => {}
11..20 => {}
5..15 => {}
_ => {}
}
match 0u8 {
0..255 => {}
255 => {}
}
// Test multiple at once
match 0u8 {
0..10 => {} //~ ERROR multiple ranges are one apart
11..20 => {}
11..30 => {}
_ => {}
}
match 0u8 {
0..10 => {} //~ ERROR multiple ranges are one apart
11..20 => {} //~ ERROR multiple ranges are one apart
21..30 => {}
_ => {}
}
match 0u8 {
00..20 => {} //~ ERROR multiple ranges are one apart
10..20 => {} //~ ERROR multiple ranges are one apart
21..30 => {}
21..40 => {}
_ => {}
}
// Test nested
match (0u8, true) {
(0..10, true) => {} //~ ERROR multiple ranges are one apart
(11..20, true) => {}
_ => {}
}
match (true, 0u8) {
(true, 0..10) => {} //~ ERROR multiple ranges are one apart
(true, 11..20) => {}
_ => {}
}
// Asymmetry due to how exhaustiveness is computed.
match (0u8, true) {
(0..10, true) => {} //~ ERROR multiple ranges are one apart
(11..20, false) => {}
_ => {}
}
match (true, 0u8) {
(true, 0..10) => {}
(false, 11..20) => {}
_ => {}
}
match Some(0u8) {
Some(0..10) => {} //~ ERROR multiple ranges are one apart
Some(11..20) => {}
_ => {}
}
}
|
