diff options
Diffstat (limited to 'tests/ui/unsafe/unsafe-fn-autoderef.rs')
-rw-r--r-- | tests/ui/unsafe/unsafe-fn-autoderef.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tests/ui/unsafe/unsafe-fn-autoderef.rs b/tests/ui/unsafe/unsafe-fn-autoderef.rs new file mode 100644 index 000000000..60460fc6e --- /dev/null +++ b/tests/ui/unsafe/unsafe-fn-autoderef.rs @@ -0,0 +1,23 @@ +struct Rec { + f: isize +} + +fn f(p: *const Rec) -> isize { + + // Test that * ptrs do not autoderef. There is a deeper reason for + // prohibiting this, beyond making unsafe things annoying (which doesn't + // actually seem desirable to me). The deeper reason is that if you + // have a type like: + // + // enum foo = *foo; + // + // you end up with an infinite auto-deref chain, which is + // currently impossible (in all other cases, infinite auto-derefs + // are prohibited by various checks, such as that the enum is + // instantiable and so forth). + + return p.f; //~ ERROR no field `f` on type `*const Rec` +} + +fn main() { +} |