[issue44368] Invalid mapping patterns give confusing SyntaxErrors

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

> Could we just try parsing "as _" and raise if so? That wouldn't conflict with any existing rules, and that way we could actually have a helpful error message.

No, the same happens with other targets such as:

 File "/home/pablogsal/github/python/master/lel.py", line 2
    case 42 as 1+1:
               ^
SyntaxError: expected ':'

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<https://bugs.python.org/issue44368>
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