Various minor crash/etc fixes#22

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insignification wants to merge 31 commits intosnoack:masterfrom

insignification:fix2

Commits on Dec 10, 2019

Properly fix `Jump out of too many nested blocks` error
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Rename new SyntaxError to be more descriptive in case ever encountered.
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Commits on Dec 13, 2019

Style & test updates (other updates to commit in following commits)
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Refactor the ops sizing/writing to avoid code duplication
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Added python 3.8 support
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Commits on Dec 14, 2019

Updated style & added py38 to tox/travis/readme
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fix line endings snafu (you'll squash anyway, so I'm keeping history)
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Remove the commented out tests (They'll come back in the next PR).
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Merge branch 'master' into py38
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Refactor previous changes to avoid duplication & fix safety issues
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Fix test_jump_out_of_try_block_and_survive.
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Avoid patching code again and again in nested functions
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Fix previous change for python2.6 (doesn't support Code weakrefs)
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Fix with blocks (add tests)
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Support jumping out of except & finally blocks!
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Add combined try/catch/finally test and remove unneccessary op
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Fixed two dumb bugs that cancelled each other out in most cases
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Fix jumping out of with blocks in py26 (and added test)
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Update merge
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Added while / while true tests & fix code to make them pass
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Commits on Dec 15, 2019

Merge branch 'master' into fix2
insignification
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Merge branch 'master' into fix2
insignification
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Style fixes
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Added tests that show remaining issues, first part of fixing them.
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Backport change from 'iter' needed for the newly added tests
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Refactor _find_labels_and_gotos to use a class instead of nested funcs
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Avoid __pypy__ import and instead always call END_FINALLY when possible
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Go a step further and always call END_FINALLY - make it possible in 3.8
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flakate
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Update comment
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Minor code change
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