Auto merge of #103509 - compiler-errors:opaques-w-bound-vars-r-hard, r=oli-obk

Revert "Normalize opaques with escaping bound vars"

This caused a perf regression in #103423, cc `@skyzh` this should fix #103423.

reverts #100980

r? `@oli-obk`

3 files changed, 47 insertions, 24 deletions

diff --git a/src/test/ui/impl-trait/normalize-tait-in-const.rs b/src/test/ui/impl-trait/normalize-tait-in-const.rs
new file mode 100644
index 00000000000..020bcbb8396
--- /dev/null
+++ b/src/test/ui/impl-trait/normalize-tait-in-const.rs
@@ -0,0 +1,39 @@
+// known-bug: #103507
+// failure-status: 101
+// normalize-stderr-test "note: .*\n\n" -> ""
+// normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
+// rustc-env:RUST_BACKTRACE=0
+
+#![feature(type_alias_impl_trait)]
+#![feature(const_trait_impl)]
+#![feature(const_refs_to_cell)]
+#![feature(inline_const)]
+
+use std::marker::Destruct;
+
+trait T {
+    type Item;
+}
+
+type Alias<'a> = impl T<Item = &'a ()>;
+
+struct S;
+impl<'a> T for &'a S {
+    type Item = &'a ();
+}
+
+const fn filter_positive<'a>() -> &'a Alias<'a> {
+    &&S
+}
+
+const fn with_positive<F: ~const for<'a> Fn(&'a Alias<'a>) + ~const Destruct>(fun: F) {
+    fun(filter_positive());
+}
+
+const fn foo(_: &Alias<'_>) {}
+
+const BAR: () = {
+    with_positive(foo);
+};
+
+fn main() {}
diff --git a/src/test/ui/impl-trait/normalize-tait-in-const.stderr b/src/test/ui/impl-trait/normalize-tait-in-const.stderr
new file mode 100644
index 00000000000..b9fc8726ffc
--- /dev/null
+++ b/src/test/ui/impl-trait/normalize-tait-in-const.stderr
@@ -0,0 +1,8 @@
+error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:198:90: Failed to normalize <for<'a, 'b> fn(&'a Alias<'b>) {foo} as std::ops::FnOnce<(&&S,)>>::Output, maybe try to call `try_normalize_erasing_regions` instead
+
+query stack during panic:
+#0 [eval_to_allocation_raw] const-evaluating + checking `BAR`
+#1 [eval_to_const_value_raw] simplifying constant for the type system `BAR`
+end of query stack
+error: aborting due to previous error
+
diff --git a/src/tools/miri/tests/pass/issues/issue-miri-2433.rs b/src/tools/miri/tests/pass/issues/issue-miri-2433.rs
deleted file mode 100644
index a8281d30bac..00000000000
--- a/src/tools/miri/tests/pass/issues/issue-miri-2433.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-#![feature(type_alias_impl_trait)]
-
-trait T {
-    type Item;
-}
-
-type Alias<'a> = impl T<Item = &'a ()>;
-
-struct S;
-impl<'a> T for &'a S {
-    type Item = &'a ();
-}
-
-fn filter_positive<'a>() -> Alias<'a> {
-    &S
-}
-
-fn with_positive(fun: impl Fn(Alias<'_>)) {
-    fun(filter_positive());
-}
-
-fn main() {
-    with_positive(|_| ());
-}