Auto merge of #113210 - fee1-dead-contrib:effects-mvp, r=oli-obk

Effects/keyword generics MVP

This adds `feature(effects)`, which adds `const host: bool` to the generics of const functions, const traits and const impls. This will be used to replace the current logic around const traits.

r? `@oli-obk`

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/helloworld.rs b/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/helloworld.rs
new file mode 100644
index 00000000000..49457354cc9
--- /dev/null
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/effects/helloworld.rs
@@ -0,0 +1,29 @@
+// check-pass
+
+// gate-test-effects
+// ^ effects doesn't have a gate so we will trick tidy into thinking this is a gate test
+
+#![feature(const_trait_impl, effects, rustc_attrs)]
+
+// ensure we are passing in the correct host effect in always const contexts.
+
+pub const fn hmm</* T, */ #[rustc_host] const host: bool = true>() -> usize {
+    if host {
+        1
+    } else {
+        0
+    }
+}
+
+const _: () = {
+    let x = hmm();
+    assert!(0 == x);
+};
+
+/* FIXME(effects)
+pub const fn uwu(x: [u8; hmm::<()>()]) {
+    let [] = x;
+}
+*/
+
+fn main() {}