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- Dealias pattern types before launching the CheckabilityChecker
- Sharpen the error messages to explain that the dealiased type
is the expansion of the alias.
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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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To make that viable, suppression of unchecked warnings is now available
on a per-type-argument basis. The @unchecked annotation has hereby been
generalized beyond exhaustiveness to mean context-dependent "disable further
compiler checking on this entity." Example of new usage:
def f(x: Any) = x match {
case xs: List[String @unchecked] => xs.head // no warning
case xs: List[Int] => xs.head // unchecked warning
}
It turns out -unchecked has been put to other noisy uses such as
the pattern matcher complaining about its budget like a careworn spouse.
This actually simplified the path forward: I left -unchecked in place
for that and general compatibility, so those warnings can be enabled
as before with -unchecked. The erasure warnings I turned into regular
warnings, subject to suppression by @unchecked.
Review by @odersky.
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