diff options
Diffstat (limited to 'tests/ui/associated-types/associated-types-stream.rs')
-rw-r--r-- | tests/ui/associated-types/associated-types-stream.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/associated-types/associated-types-stream.rs b/tests/ui/associated-types/associated-types-stream.rs new file mode 100644 index 000000000..c9b302b96 --- /dev/null +++ b/tests/ui/associated-types/associated-types-stream.rs @@ -0,0 +1,38 @@ +// run-pass +// Test references to the trait `Stream` in the bounds for associated +// types defined on `Stream`. Issue #20551. + +trait Stream { + type Car; + type Cdr: Stream; + + fn car(&self) -> Self::Car; + fn cdr(self) -> Self::Cdr; +} + +impl Stream for () { + type Car = (); + type Cdr = (); + fn car(&self) -> () { () } + fn cdr(self) -> () { self } +} + +impl<T,U> Stream for (T, U) + where T : Clone, U : Stream +{ + type Car = T; + type Cdr = U; + fn car(&self) -> T { self.0.clone() } + fn cdr(self) -> U { self.1 } +} + +fn main() { + let p = (22, (44, (66, ()))); + assert_eq!(p.car(), 22); + + let p = p.cdr(); + assert_eq!(p.car(), 44); + + let p = p.cdr(); + assert_eq!(p.car(), 66); +} |