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| author | Eugene Burmako <xeno.by@gmail.com> | 2012-09-06 21:05:17 +0200 |
|---|---|---|
| committer | Eugene Burmako <xeno.by@gmail.com> | 2012-09-06 23:19:20 +0200 |
| commit | 6a740332c7bfd56b20993be6ecd0bf818104f56c (patch) | |
| tree | 6884bd48506c9e2468d07cfcf7433121c04cfac2 /test/files/run/t6318_derived.check | |
| parent | adf2d3632b07eef4fc2303aef994e66584a73f49 (diff) | |
| download | scala-6a740332c7bfd56b20993be6ecd0bf818104f56c.tar.gz scala-6a740332c7bfd56b20993be6ecd0bf818104f56c.tar.bz2 scala-6a740332c7bfd56b20993be6ecd0bf818104f56c.zip | |
SI-6318 fixes ClassTag.unapply for primitives
ClassTag.unapply now has overloads for primitive value classes
so that it can preserve boxiness when performing subtyping tests.
First I wanted to annotate ClassTag.unapply with a ClassTag itself,
i.e. to transform its signature from "def unapply(x: Any): Option[T]"
to "def unapply[U: ClassTag](x: U): Option[T]".
But then virtpatmat_typetag.scala exhibited a nasty problem.
When pattern matching with this unapply, patmat first infers U as something
and then tries to pattern match against this inferred type. And if U gets
inferred as an abstract type itself, bad things happen:
warning: The outer reference in this type test cannot be checked at run time.
That's why I decided to drop the ClassTag idea and go with 9 extra overloads.
Not very beautiful, but definitely robust.
Diffstat (limited to 'test/files/run/t6318_derived.check')
| -rw-r--r-- | test/files/run/t6318_derived.check | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/test/files/run/t6318_derived.check b/test/files/run/t6318_derived.check new file mode 100644 index 0000000000..ad43b6579b --- /dev/null +++ b/test/files/run/t6318_derived.check @@ -0,0 +1,3 @@ +Some(X)
+true
+Some(X)
|