# Buggy code
def hy2py_main():
    import platform

    options = dict(
        prog="hy2py",
        usage="%(prog)s [options] [FILE]",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser = argparse.ArgumentParser(**options)
    parser.add_argument(
        "FILE",
        type=str,
        nargs="?",
        help='Input Hy code (use STDIN if "-" or not provided)',
    )
    parser.add_argument(
        "--with-source",
        "-s",
        action="store_true",
        help="Show the parsed source structure",
    )
    parser.add_argument(
        "--with-ast", "-a", action="store_true", help="Show the generated AST"
    )
    parser.add_argument(
        "--without-python",
        "-np",
        action="store_true",
        help=("Do not show the Python code generated from the AST"),
    )

    options = parser.parse_args(sys.argv[1:])

    if options.FILE is None or options.FILE == "-":
        source = sys.stdin.read()
        with filtered_hy_exceptions():
            hst = hy_parse(source, filename="<stdin>")
    else:
        with (
            filtered_hy_exceptions(),
            io.open(options.FILE, "r", encoding="utf-8") as source_file,
        ):
            source = source_file.read()
            hst = hy_parse(source, filename=options.FILE)

    if options.with_source:
        # need special printing on Windows in case the
        # codepage doesn't support utf-8 characters
        if PY3 and platform.system() == "Windows":
            for h in hst:
                try:
                    print(h)
                except:
                    print(str(h).encode("utf-8"))
        else:
            print(hst)
        print()
        print()

    with filtered_hy_exceptions():
        _ast = hy_compile(hst, "__main__")

    if options.with_ast:
        if PY3 and platform.system() == "Windows":
            _print_for_windows(astor.dump_tree(_ast))
        else:
            print(astor.dump_tree(_ast))
        print()
        print()

    if not options.without_python:
        if PY3 and platform.system() == "Windows":
            _print_for_windows(astor.code_gen.to_source(_ast))
        else:
            print(astor.code_gen.to_source(_ast))

    parser.exit(0)


# Traceback (hy.errors.HyCompileError)
Traceback (most recent call last):
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/importer.py", line 180, in hy_eval
_ast, expr = hy_compile(hytree, module_name, get_expr=True)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 2213, in hy_compile
result = compiler.compile(tree)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 460, in compile
ret = self.compile_atom(_type, tree)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 1731, in compile_expression
ret = self.compile_atom(fn, expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 819, in compile_do
return self._compile_branch(expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 545, in _compile_branch
return _branch(self.compile(expr) for expr in exprs)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 318, in _branch
results = list(results)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 545, in <genexpr>
return _branch(self.compile(expr) for expr in exprs)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 460, in compile
ret = self.compile_atom(_type, tree)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 1731, in compile_expression
ret = self.compile_atom(fn, expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 372, in checker
return fn(self, expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 873, in compile_try_expression
name)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 1002, in _compile_catch_expression
body = self._compile_branch(expr)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 545, in _compile_branch
return _branch(self.compile(expr) for expr in exprs)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 318, in _branch
results = list(results)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 545, in <genexpr>
return _branch(self.compile(expr) for expr in exprs)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 460, in compile
ret = self.compile_atom(_type, tree)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 1731, in compile_expression
ret = self.compile_atom(fn, expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 372, in checker
return fn(self, expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 858, in compile_try_expression
body += self.compile(expr.pop(0))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 472, in compile
raise_empty(HyCompileError, e, sys.exc_info()[2])
File "<string>", line 1, in raise_empty
hy.errors.HyCompileError: Internal Compiler Bug 😱
⤷ ImportError: cannot require names: [HySymbol('let')]
Compilation traceback:
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 460, in compile
ret = self.compile_atom(_type, tree)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 1731, in compile_expression
ret = self.compile_atom(fn, expression)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 447, in compile_atom
else _compile_table[atom_type](self, atom))
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/compiler.py", line 1486, in compile_require
require(module, self.module_name, assignments=assignments)
File "/home/johnzhuang/.virtualenvs/hy/lib/python3.6/site-packages/hy/macros.py", line 106, in require
raise ImportError("cannot require names: " + repr(list(unseen)))

# Fixed code
def hy2py_main():
    import platform

    options = dict(
        prog="hy2py",
        usage="%(prog)s [options] [FILE]",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser = argparse.ArgumentParser(**options)
    parser.add_argument(
        "FILE",
        type=str,
        nargs="?",
        help='Input Hy code (use STDIN if "-" or not provided)',
    )
    parser.add_argument(
        "--with-source",
        "-s",
        action="store_true",
        help="Show the parsed source structure",
    )
    parser.add_argument(
        "--with-ast", "-a", action="store_true", help="Show the generated AST"
    )
    parser.add_argument(
        "--without-python",
        "-np",
        action="store_true",
        help=("Do not show the Python code generated from the AST"),
    )

    options = parser.parse_args(sys.argv[1:])

    if options.FILE is None or options.FILE == "-":
        filename = "<stdin>"
        source = sys.stdin.read()
    else:
        filename = options.FILE
        with io.open(options.FILE, "r", encoding="utf-8") as source_file:
            source = source_file.read()

    with filtered_hy_exceptions():
        hst = hy_parse(source, filename=filename)

    if options.with_source:
        # need special printing on Windows in case the
        # codepage doesn't support utf-8 characters
        if PY3 and platform.system() == "Windows":
            for h in hst:
                try:
                    print(h)
                except:
                    print(str(h).encode("utf-8"))
        else:
            print(hst)
        print()
        print()

    with filtered_hy_exceptions():
        _ast = hy_compile(hst, "__main__", filename=filename, source=source)

    if options.with_ast:
        if PY3 and platform.system() == "Windows":
            _print_for_windows(astor.dump_tree(_ast))
        else:
            print(astor.dump_tree(_ast))
        print()
        print()

    if not options.without_python:
        if PY3 and platform.system() == "Windows":
            _print_for_windows(astor.code_gen.to_source(_ast))
        else:
            print(astor.code_gen.to_source(_ast))

    parser.exit(0)