diff options
| -rw-r--r-- | components/style/selector_map.rs | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/components/style/selector_map.rs b/components/style/selector_map.rs index d4775f315ab..193196c488a 100644 --- a/components/style/selector_map.rs +++ b/components/style/selector_map.rs @@ -25,12 +25,12 @@ use stylist::Rule; /// A hasher implementation that doesn't hash anything, because it expects its /// input to be a suitable u32 hash. pub struct PrecomputedHasher { - hash: u32, + hash: Option<u32>, } impl Default for PrecomputedHasher { fn default() -> Self { - Self { hash: 0 } + Self { hash: None } } } @@ -43,17 +43,19 @@ pub type PrecomputedHashSet<K> = HashSet<K, BuildHasherDefault<PrecomputedHasher impl Hasher for PrecomputedHasher { #[inline] fn write(&mut self, _: &[u8]) { - unreachable!() + unreachable!("Called into PrecomputedHasher with something that isn't \ + a u32") } #[inline] fn write_u32(&mut self, i: u32) { - self.hash = i; + debug_assert!(self.hash.is_none()); + self.hash = Some(i); } #[inline] fn finish(&self) -> u64 { - self.hash as u64 + self.hash.expect("PrecomputedHasher wasn't fed?") as u64 } } |