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Diffstat (limited to 'src/test/ui/associated-types/associated-types-enum-field-named.rs')
-rw-r--r-- | src/test/ui/associated-types/associated-types-enum-field-named.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-enum-field-named.rs b/src/test/ui/associated-types/associated-types-enum-field-named.rs new file mode 100644 index 000000000..896d67213 --- /dev/null +++ b/src/test/ui/associated-types/associated-types-enum-field-named.rs @@ -0,0 +1,35 @@ +// run-pass +// Test associated types appearing in struct-like enum variants. + + +use self::VarValue::*; + +pub trait UnifyKey { + type Value; + fn to_index(&self) -> usize; +} + +pub enum VarValue<K:UnifyKey> { + Redirect { to: K }, + Root { value: K::Value, rank: usize }, +} + +fn get<'a,K:UnifyKey<Value=Option<V>>,V>(table: &'a Vec<VarValue<K>>, key: &K) -> &'a Option<V> { + match table[key.to_index()] { + VarValue::Redirect { to: ref k } => get(table, k), + VarValue::Root { value: ref v, rank: _ } => v, + } +} + +impl UnifyKey for usize { + type Value = Option<char>; + fn to_index(&self) -> usize { *self } +} + +fn main() { + let table = vec![/* 0 */ Redirect { to: 1 }, + /* 1 */ Redirect { to: 3 }, + /* 2 */ Root { value: Some('x'), rank: 0 }, + /* 3 */ Redirect { to: 2 }]; + assert_eq!(get(&table, &0), &Some('x')); +} |