[issue17792] Unhelpful UnboundLocalError due to del'ing of exception target

[Nick Coghlan]

Nick Coghlan added the comment:

I don't think we want to mess with the control flow, as that would be even weirder and may interact strangely with else and finally clauses.

A SyntaxWarning would be unconditional (so it doesn't matter whether or not the exception is triggered at run time), happens at compile time (so developers will see it), but won't be triggered when loading from a cached bytecode file (so end users typically won't see it).

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<http://bugs.python.org/issue17792>
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