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author | Paul Phillips <paulp@improving.org> | 2013-10-01 20:28:48 -0700 |
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committer | Paul Phillips <paulp@improving.org> | 2013-10-01 20:41:41 -0700 |
commit | 5708e9d73ba01c286d7155606b72caeab914face (patch) | |
tree | 422ca2158adb3392aa3826ea9ab9cae4a379f5ce /test/files/neg/t6680a.scala | |
parent | 95d5554b9a263e3eb060c181463234f3e79864ab (diff) | |
download | scala-5708e9d73ba01c286d7155606b72caeab914face.tar.gz scala-5708e9d73ba01c286d7155606b72caeab914face.tar.bz2 scala-5708e9d73ba01c286d7155606b72caeab914face.zip |
SI-6680 unsoundness in gadt typing.
Introduces -Xstrict-inference to deal with the significant
gap between soundness and what presently compiles. I'm hopeful
that it's TOO strict, because it finds e.g. 75 errors compiling
immutable/IntMap.scala, but it might be that bad.
Diffstat (limited to 'test/files/neg/t6680a.scala')
-rw-r--r-- | test/files/neg/t6680a.scala | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/files/neg/t6680a.scala b/test/files/neg/t6680a.scala new file mode 100644 index 0000000000..93b796438f --- /dev/null +++ b/test/files/neg/t6680a.scala @@ -0,0 +1,18 @@ +case class Cell[A](var x: A) +object Test { + def f1(x: Any) = x match { case y @ Cell(_) => y } // Inferred type is Cell[Any] + def f2(x: Cell[_]) = x match { case y @ Cell(_) => y } // Inferred type is Cell[_] + def f3[A](x: Cell[A]) = x match { case y @ Cell(_) => y } // Inferred type is Cell[A] + + def main(args: Array[String]): Unit = { + val x = new Cell(1) + val y = f1(x) + y.x = "abc" + println(x.x + 1) + } +} + +// The tweetable variation +object Tweet { + case class C[A](f:A=>A);def f(x:Any)=x match { case C(f)=>f("") };f(C[Int](x=>x)) +} |