convertop        1339 src/cmd/gc/go.h int	convertop(Type *src, Type *dst, char **why);
convertop        2106 src/cmd/gc/subr.c 		convertop(n->type, t, nil) == OCONVNOP)
convertop        1450 src/cmd/gc/typecheck.c 		if((n->op = convertop(t, n->type, &why)) == 0) {