shithub: regress

ref: ac7c8364ea8f5992e6e56d6f0073869bcf64bb0d
dir: /cmd/cpp/ncat.test/

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#define NCAT(a)	foo ## a
NCAT(bar)

#define XCAT(a)	## a
foo XCAT(bar)

#define CAT3(foo)	a##foo##b
CAT3(blah)