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Diffstat (limited to 'tests/ui/pattern/usefulness/guards.rs')
-rw-r--r-- | tests/ui/pattern/usefulness/guards.rs | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/pattern/usefulness/guards.rs b/tests/ui/pattern/usefulness/guards.rs new file mode 100644 index 000000000..b15440cf6 --- /dev/null +++ b/tests/ui/pattern/usefulness/guards.rs @@ -0,0 +1,22 @@ +#![feature(exclusive_range_pattern)] +#![deny(unreachable_patterns)] + +enum Q { R(Option<usize>) } + +pub fn main() { + match Q::R(None) { + Q::R(S) if S.is_some() => {} + _ => {} + } + + match 0u8 { //~ ERROR non-exhaustive patterns + 0 .. 128 => {} + 128 ..= 255 if true => {} + } + + match 0u8 { + 0 .. 128 => {} + 128 ..= 255 if false => {} + 128 ..= 255 => {} // ok, because previous arm was guarded + } +} |