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author | Jason Zaugg <jzaugg@gmail.com> | 2015-03-17 16:17:04 -0700 |
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committer | Jason Zaugg <jzaugg@gmail.com> | 2015-03-17 16:17:04 -0700 |
commit | 79c053738b8907e461e5087f63d247a64271509a (patch) | |
tree | 5f29c54b7b61e05346ad28c77e01e0d0b96ab07e /test/files/run/t9223b.scala | |
parent | fa33395a25c87115c910e8d4a4124aee6134062b (diff) | |
download | scala-79c053738b8907e461e5087f63d247a64271509a.tar.gz scala-79c053738b8907e461e5087f63d247a64271509a.tar.bz2 scala-79c053738b8907e461e5087f63d247a64271509a.zip |
SI-9223 By-name constructor params should not be aliased
Usually, the compiler tries avoids creating a field in a subclass
for a constructor parameter that is known to be stored in a field
in one of its superclasses.
However, in the enclosed test `run/t9223.scala`, this mechanism
confuses `=> A` with `A`, which results in a runtime
`ClassCastException`.
This commit avoids using param aliases for by-name parameters.
I have also added a test for something close the opposite case, where
the subclass has a strict parameter and the superclass has a by-name
parameter. This was working correctly before this patch.
Diffstat (limited to 'test/files/run/t9223b.scala')
-rw-r--r-- | test/files/run/t9223b.scala | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/test/files/run/t9223b.scala b/test/files/run/t9223b.scala new file mode 100644 index 0000000000..2afc7ddfe0 --- /dev/null +++ b/test/files/run/t9223b.scala @@ -0,0 +1,8 @@ +class X(x: => String) { def xx = x } +class Y(y: String) extends X(y) { def f = y } + +object Test { + def main(args: Array[String]): Unit = { + assert(new Y("hi").f == "hi") + } +} |