Handle ASDLSyntaxErrors gracefully

[thomaslee]

BPO	2725
Nosy	@birkenfeld
Files	fix-asdl-errors.patch: A patch to correct the handling of ASDL syntax errors

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/birkenfeld'
closed_at = <Date 2009-04-12.11:34:21.852>
created_at = <Date 2008-04-30.12:08:02.227>
labels = ['type-bug', 'build']
title = 'Handle ASDLSyntaxErrors gracefully'
updated_at = <Date 2009-04-12.11:34:21.851>
user = 'https://bugs.python.org/thomaslee'

bugs.python.org fields:

activity = <Date 2009-04-12.11:34:21.851>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-04-12.11:34:21.852>
closer = 'georg.brandl'
components = ['Build']
creation = <Date 2008-04-30.12:08:02.227>
creator = 'thomaslee'
dependencies = []
files = ['10144']
hgrepos = []
issue_num = 2725
keywords = ['patch']
message_count = 3.0
messages = ['65999', '66020', '85893']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'thomaslee']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue2725'
versions = ['Python 3.0']

[thomaslee]

The current code in Parser/asdl.py doesn't handle syntax errors very
well. A minor problem to be sure, since the net result is the same (i.e.
build fails), but the error message being displayed is entirely
unhelpful to the developer.

The attached patch will display the error message as was seemingly intended.

This probably affects earlier versions (including python-trunk), but I
haven't tested.

[birkenfeld]

Some comments:

• Since you check for a false mod before calling check(), the check in
  check() will not be reached.
• The error print seems to be already in trunk.

[birkenfeld]

Committed a similar patch in r71505.