gccrs: nr2.0: Fix test const_generics_3.rs

gcc/testsuite/ChangeLog:

	* rust/compile/const_generics_3.rs: Modify test to run with name
	resolution 2.0 only and to handle the absence of a bogus
	resolution error.
	* rust/compile/nr2/exclude: Remove const_generics_3.rs.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

gcc/testsuite/rust/compile/const_generics_3.rs

@@ -1,10 +1,12 @@
-// { dg-additional-options "-w" }
+// { dg-additional-options "-w -frust-name-resolution-2.0" }
+
+#[lang = "sized"]
+trait Sized {}
 
 const M: usize = 4;
 
 struct Foo<T, const N: usize = 1> {
-    // FIXME: This error is bogus. But having it means parsing is valid!
-    value: [i32; N], // { dg-error "cannot find value .N. in this scope" }
+    value: [T; N],
 }
 
 fn main() {

gcc/testsuite/rust/compile/nr2/exclude

@@ -1,6 +1,5 @@
 canonical_paths1.rs
 cfg1.rs
-const_generics_3.rs
 generics9.rs
 issue-2043.rs
 issue-2330.rs