`ast.main` is not covered

[sobolevn]

All this code is not covered:

cpython/Lib/ast.py

Lines 1712 to 1737 in b652d40

	def main():
	import argparse
	parser = argparse.ArgumentParser(prog='python -m ast')
	parser.add_argument('infile', type=argparse.FileType(mode='rb'), nargs='?',
	default='-',
	help='the file to parse; defaults to stdin')
	parser.add_argument('-m', '--mode', default='exec',
	choices=('exec', 'single', 'eval', 'func_type'),
	help='specify what kind of code must be parsed')
	parser.add_argument('--no-type-comments', default=True, action='store_false',
	help="don't add information about type comments")
	parser.add_argument('-a', '--include-attributes', action='store_true',
	help='include attributes such as line numbers and '
	'column offsets')
	parser.add_argument('-i', '--indent', type=int, default=3,
	help='indentation of nodes (number of spaces)')
	args = parser.parse_args()
	with args.infile as infile:
	source = infile.read()
	tree = parse(source, args.infile.name, args.mode, type_comments=args.no_type_comments)
	print(dump(tree, include_attributes=args.include_attributes, indent=args.indent))
	if __name__ == '__main__':
	main()

Proof: https://github.com/python/cpython/blob/b652d40f1c88fcd8595cd401513f6b7f8e499471/Lib/test/test_ast.py

If I remove def main, tests still pass.

So, my proposal is: add a simple test case that ensures that ast.main is there. I don't think that we need any fancy stuff. ast.main is only a thin wrapper around ast.parse and ast.dump which are fully tested on their own.

Linked PRs

• gh-101821: Cover ast.main function #101822