Properly fix Jump out of too many nested blocks
error
#20
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This fixes issue #19
The fix is to - if there isn't enough space to write the new bytecode in-place - write it at the end of the bytecode array and add jumps to/from there.
It replaces the previous attempted fix for this issue, as including both would be too complex and
is unneeded.
The tests have been updated (previously they were checking that the issue exists), and a new even more extreme test has been added.
Result observed to work correctly in "real" code. (No, not production code :P)
Tested on pypy3.6
Please test on other python versions. (I can't easily install them here)