1 /* Test :: token in C2x. */ 2 /* { dg-do preprocess } */ 3 /* { dg-options "-std=c2x -pedantic-errors" } */ 4 5 #define CONCAT(x, y) x ## y 6 7 CONCAT (:, :) 8 CONCAT (::, >) /* { dg-error "does not give a valid preprocessing token" } */ 9