Warn on variables that are only ever referenced #843
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Sep 1, 2024
See Coconut's [documentation](http://coconut.readthedocs.io/en/develop/DOCS.html) for more information on all of the features listed below. Bugfixes: * #851, #852: Fixed comments inside of parentheses in the Jupyter kernel. Language features: * #846: `reduce`, `takewhile`, and `dropwhile` now support keyword arguments. * #848: Class and data patterns now support keyword argument name elision. * #847: New pattern-matching syntax for matching anonymous named tuples. Compiler features: * #843: Added compiler warnings for (some cases of) undefined variables.
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Given that we can distinguish between a variable reference and definition, if at the end of a file we've only seen a name referenced but never defined, we should show a warning.
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