diff options
Diffstat (limited to 'src/test/ui/type-alias-impl-trait/wf-check-fn-ptrs.rs')
-rw-r--r-- | src/test/ui/type-alias-impl-trait/wf-check-fn-ptrs.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/wf-check-fn-ptrs.rs b/src/test/ui/type-alias-impl-trait/wf-check-fn-ptrs.rs new file mode 100644 index 000000000..3b8470e4a --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/wf-check-fn-ptrs.rs @@ -0,0 +1,23 @@ +#![feature(type_alias_impl_trait)] + +// build-pass + +trait Bar { + fn bar(&self); +} + +type FooFn<B> = impl FnOnce(B); + +fn foo<B: Bar>() -> FooFn<B> { + fn mop<B: Bar>(bar: B) { bar.bar() } + mop as fn(B) + // function pointers don't have any obligations on them, + // thus the above compiles. It's obviously unsound to just + // procure a `FooFn` from the ether without making sure that + // the pointer is actually legal for all `B` +} + +fn main() { + let boom: FooFn<u32> = unsafe { core::mem::zeroed() }; + boom(42); +} |