From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- tests/ui/specialization/issue-70442.rs | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 tests/ui/specialization/issue-70442.rs (limited to 'tests/ui/specialization/issue-70442.rs') diff --git a/tests/ui/specialization/issue-70442.rs b/tests/ui/specialization/issue-70442.rs new file mode 100644 index 000000000..d41b5355c --- /dev/null +++ b/tests/ui/specialization/issue-70442.rs @@ -0,0 +1,23 @@ +#![feature(specialization)] //~ WARN the feature `specialization` is incomplete + +// check-pass + +trait Trait { + type Assoc; +} + +impl Trait for T { + default type Assoc = bool; +} + +// This impl inherits the `Assoc` definition from above and "locks it in", or finalizes it, making +// child impls unable to further specialize it. However, since the specialization graph didn't +// correctly track this, we would refuse to project `Assoc` from this impl, even though that should +// happen for items that are final. +impl Trait for () {} + +fn foo>() {} + +fn main() { + foo::<()>(); // `<() as Trait>::Assoc` is normalized to `bool` correctly +} -- cgit v1.2.3