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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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Conflicts:
bincompat-forward.whitelist.conf
src/compiler/scala/tools/nsc/matching/Patterns.scala
src/compiler/scala/tools/nsc/transform/patmat/Logic.scala
src/compiler/scala/tools/nsc/typechecker/Infer.scala
src/scaladoc/scala/tools/nsc/doc/model/ModelFactory.scala
test/files/neg/t5663-badwarneq.check
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There's a very dangerous situation running around when you
combine universal equality with value classes:
// All over your code
val x = "abc"
if (x == "abc") ...
// Hey let's make x a value class
val x = new ValueClass("abc")
// Uh-oh
There was until now no warning when comparing a value class
with something else. Now there is.
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Instead of changing warnings to errors mid-stream, at the end of
a run I check for condition "no errors, some warnings, and fatal
warnings" and then generate an error at that point. This is
necessary to test for some warnings which come from later stages.
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Re-enable testing the sensibility of comparing instances
of two case classes. In particular, warn if we detect that
the two objects inherit from different case classes. In
addition, avoid emitting misleading warnings when comparing "new C".
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