Use a different error code to avoid conflicts

src/librustc_typeck/check/mod.rs

@@ -4892,7 +4892,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                 let mut err = struct_span_err! {
                     self.tcx.sess,
                     span,
-                    E0631,
+                    E0632,
                     "cannot provide explicit type parameters when `impl Trait` is \
                     used in argument position."
                 };

src/librustc_typeck/diagnostics.rs

@@ -4677,6 +4677,6 @@ register_diagnostics! {
     E0592, // duplicate definitions with name `{}`
 //  E0613, // Removed (merged with E0609)
     E0627, // yield statement outside of generator literal
-    E0631, // cannot provide explicit type parameters when `impl Trait` is used in
+    E0632, // cannot provide explicit type parameters when `impl Trait` is used in
            // argument position.
 }