[issue20273] Argument Clinic: unhelpful crashes

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

Sometimes when Argument Clinic see something wrong, it raises exception and exit with printed traceback, instead of output helpful error message which points on line with illegal syntax.

I open this issue to report about such problems.

$ ./python Tools/clinic/clinic.py -f Modules/zlibmodule.c
Traceback (most recent call last):
  File "Tools/clinic/clinic.py", line 3032, in <module>
    sys.exit(main(sys.argv[1:]))
  File "Tools/clinic/clinic.py", line 3028, in main
    parse_file(filename, output=ns.output, verify=not ns.force)
  File "Tools/clinic/clinic.py", line 1135, in parse_file
    cooked = clinic.parse(raw)
  File "Tools/clinic/clinic.py", line 1085, in parse
    parser.parse(block)
  File "Tools/clinic/clinic.py", line 2262, in parse
    self.state(line)
  File "Tools/clinic/clinic.py", line 2582, in state_parameter
    value = eval(py_default)
  File "<string>", line 1, in <module>
NameError: name 'zlib' is not defined

zlibmodule.c is almost same as after applying patch from issue20193 (with several clinic bugs already fixed).

----------
components: Demos and Tools
messages: 208188
nosy: larry, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Argument Clinic: unhelpful crashes
type: behavior
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20273>
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