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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
#define STRINGIFY(x) #x
// Should be
// CONCAT(a, b) A2B2 CONCAT(a, b)
// CONCAT is disabled, A and B are expanded on next pass
// A2 B2 are first and last tokens pre expansion args
//
// Old Slang outputs
// ab ab ab
CONCAT(CONCAT(A, B) A2, B2 CONCAT(A, B))
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