handle unevaluated consts after monomophize

src/test/ui/const-generics/issues/issue-70125.rs

@@ -0,0 +1,19 @@
+// run-pass
+#![feature(const_generics)]
+//~^ WARN the feature `const_generics` is incomplete and may cause the compiler to crash
+
+const L: usize = 4;
+
+pub trait Print<const N: usize> {
+    fn print(&self) -> usize {
+        N
+    }
+}
+
+pub struct Printer;
+impl Print<L> for Printer {}
+
+fn main() {
+    let p = Printer;
+    assert_eq!(p.print(), 4);
+}

src/test/ui/const-generics/issues/issue-70125.stderr

@@ -0,0 +1,8 @@
+warning: the feature `const_generics` is incomplete and may cause the compiler to crash
+  --> $DIR/issue-70125.rs:2:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+

src/test/ui/const-generics/normalization_failure.rs

@@ -0,0 +1,16 @@
+// run-pass
+
+#![feature(const_generics)]
+//~^ WARN the feature `const_generics` is incomplete and may cause the compiler to crash
+
+fn main() {
+    <()>::foo();
+}
+
+trait Foo<const X: usize> {
+    fn foo() -> usize {
+        X
+    }
+}
+
+impl Foo<{3}> for () {}

src/test/ui/const-generics/normalization_failure.stderr

@@ -0,0 +1,8 @@
+warning: the feature `const_generics` is incomplete and may cause the compiler to crash
+  --> $DIR/normalization_failure.rs:3:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+