tuple index out of range in sre_compile.py in aarch64
Traceback (most recent call last):
File "<prefix>/site-packages/pip/_internal/cli/base_command.py", line 186, in _main
status = self.run(options, args)
File "<prefix>/site-packages/pip/_internal/commands/install.py", line 301, in run
wheel_cache
File "<prefix>/site-packages/pip/_internal/cli/req_command.py", line 249, in populate_requirement_set
wheel_cache=wheel_cache
File "<prefix>/site-packages/pip/_internal/req/constructors.py", line 395, in install_req_from_line
parts = parse_req_from_line(name, line_source)
File "<prefix>/site-packages/pip/_internal/req/constructors.py", line 322, in parse_req_from_line
p, extras_as_string = _strip_extras(path)
File "<prefix>/site-packages/pip/_internal/req/constructors.py", line 62, in _strip_extras
m = re.match(r'^(.+)(\[[^\]]+\])$', path)
File "<prefix>/lib-python/3/re.py", line 172, in match
return _compile(pattern, flags).match(string)
File "<prefix>/lib-python/3/re.py", line 301, in _compile
p = sre_compile.compile(pattern, flags)
File "<prefix>/lib-python/3/sre_compile.py", line 570, in compile
code = _code(p, flags)
File "<prefix>/lib-python/3/sre_compile.py", line 555, in _code
_compile(code, p.data, flags)
File "<prefix>/lib-python/3/sre_compile.py", line 146, in _compile
_compile(code, p, (flags | add_flags) & ~del_flags)
File "<prefix>/lib-python/3/sre_compile.py", line 124, in _compile
emit(av[0])
IndexError: tuple index out of range
This is with PyPy3.6 7.3.0 package in conda. Saw this issue twice today.