compiler: more consistent error message for [...]T(x)

The message should be similar to the one for "var x [...]T",
not to the message for []T(x...).

From-SVN: r200490

gcc/go/gofrontend/parse.cc

@@ -3040,7 +3040,7 @@ Parse::primary_expr(bool may_be_sink, bool may_be_composite_lit,
 		  && t->array_type()->length()->is_nil_expression())
 		{
 		  error_at(ret->location(),
-			   "invalid use of %<...%> in type conversion");
+			   "use of %<[...]%> outside of array literal");
 		  ret = Expression::make_error(loc);
 		}
 	      else