Fix issue with specifying generic arguments for primitive types

src/test/ui/usize-generic-argument-parent.rs

@@ -0,0 +1,5 @@
+fn foo() {
+    let x: usize<foo>; //~ ERROR const arguments are not allowed for this type
+}
+
+fn main() {}

src/test/ui/usize-generic-argument-parent.stderr

@@ -0,0 +1,9 @@
+error[E0109]: const arguments are not allowed for this type
+  --> $DIR/usize-generic-argument-parent.rs:2:18
+   |
+LL |     let x: usize<foo>;
+   |                  ^^^ const argument not allowed
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0109`.