Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

No, this issue is in the parser while the other is caused by the code module. 
As I mentioned, this case doesn't ask you for tokens until you close the brace, 
it just ask you for one extra token because is doing a lookahead.

If you give any extra token to satisfy the lookahead:

>>> foo[x = 1 $
  File "<stdin>", line 1
    foo[x = 1 $
        ^^^^^
SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?
>>>

It fails immediately even if you didn't close the bracket

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44201>
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