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	#define INSERT(op, pos) doinsert(p, (sop)(op), HERE()-(pos)+1, pos)			#define INSERT(op, pos) doinsert(p, (sop)(op), HERE()-(pos)+1, pos)
	#define AHEAD(pos) dofwd(p, pos, HERE()-(pos))			#define AHEAD(pos) dofwd(p, pos, HERE()-(pos))
	#define ASTERN(sop, pos) EMIT(sop, HERE()-pos)			#define ASTERN(sop, pos) EMIT(sop, HERE()-pos)
	#define HERE() (p->slen)			#define HERE() (p->slen)
	#define THERE() (p->slen - 1)			#define THERE() (p->slen - 1)
	#define THERETHERE() (p->slen - 2)			#define THERETHERE() (p->slen - 2)
	#define DROP(n) (p->slen -= (n))			#define DROP(n) (p->slen -= (n))

	#ifndef NDEBUG
	static int never = 0; /* for use in asserts; shuts lint up */
	#else
	#define never 0 /* some <assert.h>s have bugs too */
	#endif

	/* Macro used by computejump()/computematchjump() */			/* Macro used by computejump()/computematchjump() */
	#define MIN(a,b) ((a)<(b)?(a):(b))			#define MIN(a,b) ((a)<(b)?(a):(b))

	/*			/*
	- regcomp - interface for parser and compilation			- regcomp - interface for parser and compilation
	= extern int regcomp(regex_t , const char , int);			= extern int regcomp(regex_t , const char , int);
	= #define REG_BASIC 0000			= #define REG_BASIC 0000
	= #define REG_EXTENDED 0001			= #define REG_EXTENDED 0001
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