0 400   0   # -*- coding: utf-8 -*-
 1 400   0   
 0 400   0   # single character strings
 0 400   0   puts ?a
 0 400   0   puts ?\n
 0 400   0   puts ?\s
 0 400   0   puts ?\\#
 0 400   0   puts ?\u{41}
 0 400   0   puts ?\C-a
 0 400   0   puts ?\M-a
 0 400   0   puts ?\M-\C-a
 0 400   0   puts ?\C-\M-a
 0 400   0   puts ?あ
 0 400   0   puts ?"
 0 400   0   puts ?/
 0 400   0   puts ?[[1, 2]
 0 400   0   puts ?/\
 1 400   0   
 0 400   0   # symbol and ternary operator
 0 400   0   ab = /\d+/
 0 400   0   cd = /\w+/
 0 400   0   puts :ab, :cd, :/, :[]
 0 400   0   puts :/\
 1 400   0   
 0 400   0   # TODO: space after '?' and ':' is not needed
 0 400   0   puts true ?ab : cd
 0 400   0   puts true ? /\d+/ : /\w+/
 0 400   0   puts false ?ab : cd
 0 400   0   puts false ? /\d+/ : /\w+/
 0 400   0