type test patterns evade deprecation warnings

[adriaanm-da]

I'd expect two deprecation warnings (I tried on latest 2.13.x), but get none:

object Test {
    class C

    @deprecated
    type DeprecatedAlias = C
    
    @deprecated
    class DeprecatedClass

    (??? : Any) match { 
        case _ : DeprecatedAlias =>   // should emit warning
        case _ : DeprecatedClass =>   // should emit warning
    }
}

I suspect the inPattern condition in https://github.com/scala/scala/blob/5697b87cf9aafd979533a92a92331874396b8584/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala#L1778-L1779 needs to be pushed into theRefCheckTypeMap and the skipping needs to a bit more fine-grained: deprecation warnings should be emitted (since pattern matching expansion happens after refchecks, I guess the emitted code evade further checking), but bounds may still need to be ignored.

[joroKr21]

I think you're right - we should probably still call checkUndesiredProperties when inPattern