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Time for the courage of our convictions: follow the advice of my
TODO comment from SI-8244 / f62e280825 and fix `classExistentialType`
once and for all.
This is the change in the generated `canEquals` method in the test
case; we no longer get a kind conformance error.
```
--- sandbox/old.log 2015-05-27 14:31:27.000000000 +1000
+++ sandbox/new.log 2015-05-27 14:31:29.000000000 +1000
@@ -15,7 +15,7 @@
case _ => throw new IndexOutOfBoundsException(x$1.toString())
};
override <synthetic> def productIterator: Iterator[Any] = runtime.this.ScalaRunTime.typedProductIterator[Any](Stuff.this);
- <synthetic> def canEqual(x$1: Any): Boolean = x$1.$isInstanceOf[Stuff[Proxy[PP]]]();
+ <synthetic> def canEqual(x$1: Any): Boolean = x$1.$isInstanceOf[Stuff[_ <: [PP]Proxy[PP]]]();
override <synthetic> def hashCode(): Int = ScalaRunTime.this._hashCode(Stuff.this);
override <synthetic> def toString(): String = ScalaRunTime.this._toString(Stuff.this);
override <synthetic> def equals(x$1: Any): Boolean = x$1 match {
@@ -38,9 +38,3 @@
}
}
```
I also heeded my own advice to pass in a prefix to this method.
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Surely signfiicant, but I haven't determined in what way.
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Investigating the useful output of devWarning (-Xdev people,
it's good for you) led back to this comment:
"normalize to get rid of type aliases"
You may know that this is not all the normalizing does.
Normalizing also turns TypeRefs with unapplied arguments
(type constructors) into PolyTypes. That means that when
typedParentType would call typedTypeConstructor it would
find its parent had morphed into a PolyType. Not that it
noticed; it would blithely continue and unwittingly discard
the type arguments by way of appliedType (which smoothly
logged the incident, thank you appliedType.)
The simplification of typedTypeConstructor:
There was a whole complicated special treatment of AnyRef
here which appears to have become unnecessary. Removed special
treatment and lit a candle for regularity.
Updated lots of tests regarding newly not-so-special AnyRef.
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Fewer deprecation warnings, prettier trees, prettier
symbols, more polished error messages.
Oh the interesting people you meet handling warnings, I
feel sorry for you all that I get to do it all the time.
One of the characters I met invited me into the "Dead Code
Society" and that's what I'm doing on Tuesdays now. No of
course you haven't, it's a SECRET society.
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Direct compiler internals testing. It's really easy, you should probably
use it about 1000 times each. Look at the test:
run/existentials-in-compiler.scala
The checkfile contains the (string representations of the) actual
existentials from the compiler to make sure they correspond properly to
the ones in the source.
Existentials were being printed with wildcards too freely; this has been
tightened up.
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