Rollup merge of #88080 - fee1-dead:iterator-const, r=oli-obk

Skip assert ICE with default_method_body_is_const

functions marked with #[default_method_body_is_const] would
ICE when being const checked due to it not being a const function:
`tcx.is_const_fn_raw(did)` returns false. We should skip this assert
when it is marked with that attribute.

r? `@oli-obk`

1 files changed, 18 insertions, 0 deletions

diff --git a/src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-with-staged-api.rs b/src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-with-staged-api.rs
new file mode 100644
index 00000000000..d5b1a9073ac
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/default-method-body-is-const-with-staged-api.rs
@@ -0,0 +1,18 @@
+// check-pass
+
+// This was an ICE, because the compiler ensures the
+// function to be const when performing const checking,
+// but functions marked with the attribute are not const
+// *and* subject to const checking.
+
+#![feature(staged_api)]
+#![feature(const_trait_impl)]
+#![feature(const_fn_trait_bound)]
+#![stable(since = "1", feature = "foo")]
+
+trait Tr {
+    #[default_method_body_is_const]
+    fn a() {}
+}
+
+fn main() {}