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Diffstat (limited to 'tests/ui/methods/method-projection.rs')
-rw-r--r-- | tests/ui/methods/method-projection.rs | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/tests/ui/methods/method-projection.rs b/tests/ui/methods/method-projection.rs new file mode 100644 index 000000000..21d983f19 --- /dev/null +++ b/tests/ui/methods/method-projection.rs @@ -0,0 +1,61 @@ +// run-pass +// Test that we can use method notation to call methods based on a +// projection bound from a trait. Issue #20469. + +trait MakeString { + fn make_string(&self) -> String; +} + +impl MakeString for isize { + fn make_string(&self) -> String { + format!("{}", *self) + } +} + +impl MakeString for usize { + fn make_string(&self) -> String { + format!("{}", *self) + } +} + +trait Foo { + type F: MakeString; + + fn get(&self) -> &Self::F; +} + +fn foo<F:Foo>(f: &F) -> String { + f.get().make_string() +} + +struct SomeStruct { + field: isize, +} + +impl Foo for SomeStruct { + type F = isize; + + fn get(&self) -> &isize { + &self.field + } +} + +struct SomeOtherStruct { + field: usize, +} + +impl Foo for SomeOtherStruct { + type F = usize; + + fn get(&self) -> &usize { + &self.field + } +} + +fn main() { + let x = SomeStruct { field: 22 }; + assert_eq!(foo(&x), format!("22")); + + let x = SomeOtherStruct { field: 44 }; + assert_eq!(foo(&x), format!("44")); +} |