diff options
Diffstat (limited to 'src/test/ui/associated-types/associated-types-binding-in-trait.rs')
-rw-r--r-- | src/test/ui/associated-types/associated-types-binding-in-trait.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-binding-in-trait.rs b/src/test/ui/associated-types/associated-types-binding-in-trait.rs new file mode 100644 index 000000000..2e42b3a2a --- /dev/null +++ b/src/test/ui/associated-types/associated-types-binding-in-trait.rs @@ -0,0 +1,36 @@ +// run-pass +// Test a case where the associated type binding (to `bool`, in this +// case) is derived from the trait definition. Issue #21636. + + +use std::vec; + +pub trait BitIter { + type Iter: Iterator<Item=bool>; + fn bit_iter(self) -> <Self as BitIter>::Iter; +} + +impl BitIter for Vec<bool> { + type Iter = vec::IntoIter<bool>; + fn bit_iter(self) -> <Self as BitIter>::Iter { + self.into_iter() + } +} + +fn count<T>(arg: T) -> usize + where T: BitIter +{ + let mut sum = 0; + for i in arg.bit_iter() { + if i { + sum += 1; + } + } + sum +} + +fn main() { + let v = vec![true, false, true]; + let c = count(v); + assert_eq!(c, 2); +} |