Lewis Ball <[email protected]> added the comment:
Okay, on further examination `find_good_parse_start` first looks for a line
ending with ':\n', and then looks to match _synchre on that line. If it can't
find any line ending in ':\n' then it will just look for the first occurrence
of something in _synchre to truncate on. If it can't find anything at that
point, it just doesn't truncate and the whole code is checked for a bracket
match.
So the reason that
```
else
(
else)
```
works is because there is no `:` after the first else, and adding `:` will
cause the matching to fail.
This seems reasonable, and I was probably too quick to say that the function
goes back further than it needs to when looking to truncate.
It seems like then that `else` being removed from _synchre will fix this, and
mean that the only time brackets aren't matched are when invalid code is typed,
something like:
```
(
def)
```
I can put in a PR for this tomorrow (probably removing `yield` at the same
time) if this sounds like the right fix.
P.S. Here is an example of the similar `yield` error that Terry alluded to:
```
def f():
for i in range(10):
(
yield x)
```
----------
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<https://bugs.python.org/issue41388>
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