diff options
Diffstat (limited to 'tests/ui/traits/trait-upcasting/replace-vptr.rs')
-rw-r--r-- | tests/ui/traits/trait-upcasting/replace-vptr.rs | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/traits/trait-upcasting/replace-vptr.rs b/tests/ui/traits/trait-upcasting/replace-vptr.rs new file mode 100644 index 000000000..9ccfc9306 --- /dev/null +++ b/tests/ui/traits/trait-upcasting/replace-vptr.rs @@ -0,0 +1,48 @@ +// run-pass + +#![feature(trait_upcasting)] + +trait A { + fn foo_a(&self); +} + +trait B { + fn foo_b(&self); +} + +trait C: A + B { + fn foo_c(&self); +} + +struct S(i32); + +impl A for S { + fn foo_a(&self) { + unreachable!(); + } +} + +impl B for S { + fn foo_b(&self) { + assert_eq!(42, self.0); + } +} + +impl C for S { + fn foo_c(&self) { + unreachable!(); + } +} + +fn invoke_inner(b: &dyn B) { + b.foo_b(); +} + +fn invoke_outer(c: &dyn C) { + invoke_inner(c); +} + +fn main() { + let s = S(42); + invoke_outer(&s); +} |