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author | Jason Zaugg <jzaugg@gmail.com> | 2013-06-03 23:48:35 +0200 |
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committer | Jason Zaugg <jzaugg@gmail.com> | 2013-06-05 16:55:44 +0200 |
commit | 8c0f444ba550dbd2aa7071cf840aec7b6ada03cb (patch) | |
tree | c1a9c520f5023ba76e71d837e9b94d8d25065fc7 /push-binary-libs.sh | |
parent | d70c0e344d420af1d8520b0a73109850f66c518c (diff) | |
download | scala-8c0f444ba550dbd2aa7071cf840aec7b6ada03cb.tar.gz scala-8c0f444ba550dbd2aa7071cf840aec7b6ada03cb.tar.bz2 scala-8c0f444ba550dbd2aa7071cf840aec7b6ada03cb.zip |
SI-5022 Retain precise existentials through pattern matching
From the dawn of scalac's existentials, the typer widens
existentials pt-s by substituting wildcard types in places
of existential quantifiers.
In this example:
class ForSomeVsUnapply {
def test {
def makeWrap: Wrap = ???
def useRep[e](rep: (e, X[e])) = ()
val rep = makeWrap match {
case Wrap(r) => r
};
useRep(rep) // error
}
}
the type of `r` is the result of typechecking:
Apply(
fun = TypeTree(
tpe = (rep#12037: (e#12038, X#7041[e#12038]) forSome { type e#12038 })
args = Bind(r @ _) :: Nil
}
This descends to type the `Bind` with:
pt = (e#12038, X#7041[e#12038]) forSome { type e#12038 }
`dropExistential` clobbers that type to `Tuple2#1540[?, X#7041[?]]`,
which doesn't express any relationship between the two instances
of the wildcard type. `typedIdent` sort of reverses this with a call
to `makeFullyDefined`, but only ends up with:
pt = (Any#3330, X#7041[_1#12227]) forSome { type _1#12227; type e#12038 }
I suspect that this existential dropping only makes sense outside of
typechecking patterns. In pattern mode, type information flows from the
expected type onwards to the body of the case; we must not lose precision
in the types.
For SIP-18 friendly existentials, one `dropExistential` is invertable with
`makeFullyDefined`, so this hasn't been such a big problem.
The error message improvement conferred by SI-4515 took a hit.
That might be a good example to consider when reviewing this change:
Does it tell us anything interesting about this `dropExistential`
business?
Diffstat (limited to 'push-binary-libs.sh')
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