D16085: Improve support for 'with' statements.

[Francis Herne]

flherne created this revision.
flherne added reviewers: brauch, nalvarez.
Herald added a project: KDevelop.
Herald added a subscriber: kdevelop-devel.
flherne requested review of this revision.

REVISION SUMMARY
  The previous code didn't look at `__enter__()`, and assumed that all context-managers returned their own type.
  
  We also didn't account for targets other than simple names, e.g. `with Mgr() as (foo, bar):`
  
  Thanks to Nicolás Alvarez.

TEST PLAN
  Seems to work. I'll add some duchaintests before pushing.

REPOSITORY
  R53 KDevelop: Python Support

REVISION DETAIL
  https://phabricator.kde.org/D16085

AFFECTED FILES
  documentation_files/builtindocumentation.py
  duchain/declarationbuilder.cpp
  parser/ast.h
  parser/generated.h
  parser/python36.sdef

To: flherne, brauch, nalvarez
Cc: kdevelop-devel, glebaccon, antismap, iodelay, vbspam, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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