New issue 2562: Very confusing error message when using result of list.append
in rpython
https://bitbucket.org/pypy/pypy/issues/2562/very-confusing-error-message-when-using
Carl Friedrich Bolz:
This kind of RPython code produces a super confusing error message:
```
def g(l):
return l.append(1)
def dummyfn():
l = []
g(l)
return len(l)
```
the problem is the return in ``g``. The error message is in ``checkgraph``:
```
def usevar(v, in_link=None):
> assert v in vars
E assert v139 in {v140: None, v141: None, l_26: None}
```
I don't particularly care about that code, but it took me ages to figure out
why this errors :-(.
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