if WhiteSpace(c) || c == ')' {
				peekc = c
				break
			}
		}
		if i >= 100-1 { // sizeof tokenbuf - 1
			panic("atom too long\n")
		}
		tokenlen = i
		tokenbuf[i] = nilchar
		if '0' <= tokenbuf[0] && tokenbuf[0] <= '9' {
			token = '0'
		} else {
			token = 'A'
		}
	}
}

func Expect(c int) {
	if token != c {
		print("parse error: expected ", c, "\n")
		panic("parse")
	}