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This is a mere polish for the fix to allow multiple warnings.
Sensibility checks in refchecks were shown to be redundant.
This commit includes a mild refactor to reduce tabbage, and
uses a local var to flag that a warning has already been emitted.
It would be better to have the checks return true if warned,
to facilitate `nonSensically || unrelatedly`, etc., but that's
a lot of `else false`.
The check files that were updated with the redundant warnings
are reverted.
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An error suppresses all further warnings at the same position,
but multiple warnings can be heard.
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In 65340ed4ad2e, parts of RefChecks were disabled when
we traversed into the results of the new pattern matcher.
Similar logic existed for the old pattern matcher, but in
that case the Match / CaseDef nodes still existed in the tree.
The new approach was too broad: important checks no longer
scrutinized the body of cases.
This commit turns the checks back on when it finds the remnants
of a case body, which appears as an application to a label def.
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