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//DIAGNOSTIC_TEST:SIMPLE:-E
#define CONCAT(a, b) a ## b
#define A a
#define B b
#define A2 A
#define B2 B
// Gives error (as trys to concat unexpanded input)
// <source>:11:1: error: pasting formed ')CONCAT', an invalid preprocessing token
//
// Old Slang output: aabb ;
CONCAT(CONCAT(A2, A2), CONCAT(B2, B2));
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