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scheme2cps2c4py % ./compiler.py < hello.scm > hello.c
Traceback (most recent call last):
  File "/usr/home/sforman/src/scheme2cps2c4py/./compiler.py", line 7, in <module>
    main()
  File "/usr/home/sforman/src/scheme2cps2c4py/lib/compile.py", line 248, in main
    print(compile(sys.stdin))
  File "/usr/home/sforman/src/scheme2cps2c4py/lib/compile.py", line 164, in compile
    program = parse_program(input)
  File "/usr/home/sforman/src/scheme2cps2c4py/lib/compile.py", line 52, in parse_program
    return check_unbound(rename(cps_transform(tree)))
  File "/usr/home/sforman/src/scheme2cps2c4py/lib/compile.py", line 44, in check_unbound
    assert len(program.freeVariables()) == 0
AssertionError