Guido van Rossum <gu...@python.org> added the comment:

But we don't do that with any of the other (many) errors detected by later 
passes of the compiler. Those report dozens of SyntaxErrors, with good 
descriptive messages. Users can search the web for those messages too.

Also, I doubt that many people will ever get a TargetScopeError. The examples 
are all esoteric -- yes, the compiler needs to reject them, but no, they are 
not things one is likely to try intentionally. (The exception may be the 
forbidden form you're adding, [... for ... in (i := ...)].)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37757>
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