fix ICE

Author: fee1-dead

compiler/rustc_traits/src/type_op.rs

@@ -89,6 +89,7 @@ fn relate_mir_and_user_substs<'tcx>(
     def_id: hir::def_id::DefId,
     user_substs: UserSubsts<'tcx>,
 ) -> Result<(), NoSolution> {
+    let param_env = param_env.without_const();
     let UserSubsts { user_self_ty, substs } = user_substs;
     let tcx = ocx.infcx.tcx;
     let cause = ObligationCause::dummy_with_span(span);

tests/ui/const-generics/issues/issue-88119.rs

@@ -1,10 +1,4 @@
-// known-bug: #88119
-// failure-status: 101
-// normalize-stderr-test "note: .*\n" -> ""
-// normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
-// normalize-stderr-test "\s\d{1,}: .*\n" -> ""
-// normalize-stderr-test "\s at .*\n" -> ""
-// rustc-env:RUST_BACKTRACE=0
+// check-pass
 
 #![allow(incomplete_features)]
 #![feature(const_trait_impl, generic_const_exprs)]

tests/ui/const-generics/issues/issue-88119.stderr

@@ -0,0 +1,23 @@
+// check-pass
+
+struct LazyLock<T> {
+    data: (Option<T>, fn() -> T),
+}
+
+impl<T> LazyLock<T> {
+    pub const fn new(f: fn() -> T) -> LazyLock<T> {
+        LazyLock { data: (None, f) }
+    }
+}
+
+struct A<T = i32>(Option<T>);
+
+impl<T> Default for A<T> {
+    fn default() -> Self {
+        A(None)
+    }
+}
+
+static EMPTY_SET: LazyLock<A<i32>> = LazyLock::new(A::default);
+
+fn main() {}