bless the tests

Author: jdonszelmann

tests/ui/eii/type_checking/type_params_149983.rs

@@ -5,3 +5,6 @@
 
 #[eii]
 fn foo<T>() {}
+//~^ ERROR externally implementable items may not have type parameters
+
+fn main() {}

tests/ui/eii/type_checking/type_params_149983.stderr

@@ -0,0 +1,11 @@
+error[E0044]: externally implementable items may not have type parameters
+  --> $DIR/type_params_149983.rs:7:1
+   |
+LL | fn foo<T>() {}
+   | ^^^^^^^^^^^ can't have type parameters
+   |
+   = help: replace the type parameters with concrete types like `u32`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0044`.