#define isexpr(n) (n->ntype == NEXPR)
#define isjump(n) (n.otype == OJUMP)
#define isexit(n) (n.otype == OJUMP && n.osub == JEXIT)
#define isexpr(n) (n->ntype == NEXPR)
#define isjump(n) (n.otype == OJUMP)
#define isexit(n) (n.otype == OJUMP && n.osub == JEXIT)