Nick Coghlan <ncogh...@gmail.com> added the comment:
If we do decide to do this, I'm inclined to eventually make the change at the
Grammar level rather than the AST level.
Current:
comparison: expr (comp_op expr)*
comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
Future:
comparison: expr (comp_op expr)* | (containment_check)
comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'is'|'is' 'not'
containment_check: ('in'|'not' 'in') expr
However, we'd still need an intermediate step like your PR in order to emit
SyntaxWarning while still retaining the current semantics.
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<https://bugs.python.org/issue32055>
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