code: regress

ref: 0850c5b8bb1562625f822fe7b4e7c0da5f5b28f7
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)