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author | Jason Zaugg <jzaugg@gmail.com> | 2013-01-13 17:42:48 +0100 |
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committer | Adriaan Moors <adriaan.moors@typesafe.com> | 2013-01-27 22:42:02 -0800 |
commit | a87d40960bfdb4a683c05d3430a8874cb4dcff36 (patch) | |
tree | a65ddd00ebdee081055d982f6408cbfc34e9e62c /test/pending/run | |
parent | 02963d724c512251ce66502226408091686989ee (diff) | |
download | scala-a87d40960bfdb4a683c05d3430a8874cb4dcff36.tar.gz scala-a87d40960bfdb4a683c05d3430a8874cb4dcff36.tar.bz2 scala-a87d40960bfdb4a683c05d3430a8874cb4dcff36.zip |
SI-6968 Simple Tuple patterns aren't irrefutable
Reverts part of c82ecab. The parser can't assume that
a pattern `(a, b)` will match, as results of
`.isInstanceOf[Tuple2]` can't be statically known until
after the typer.
The reopens SI-1336, SI-5589 and SI-4574, in exchange for fixing
this regression SI-6968. Keeping all of those fixed will require
a better definition of irrefutability, and some acrobatics to
ensure safe passage to the ambiguous trees through typechecking.
Diffstat (limited to 'test/pending/run')
-rw-r--r-- | test/pending/run/t4574.scala | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/test/pending/run/t4574.scala b/test/pending/run/t4574.scala new file mode 100644 index 0000000000..1dde496aca --- /dev/null +++ b/test/pending/run/t4574.scala @@ -0,0 +1,13 @@ +object Test { + val xs: List[(Int, Int)] = List((2, 2), null) + + def expectMatchError[T](msg: String)(body: => T) { + try { body ; assert(false, "Should not succeed.") } + catch { case _: MatchError => println(msg) } + } + + def main(args: Array[String]): Unit = { + expectMatchError("I hereby refute null!")( for ((x, y) <- xs) yield x ) + expectMatchError("I denounce null as unListLike!")( (null: Any) match { case List(_*) => true } ) + } +} |