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author | Martin Odersky <odersky@gmail.com> | 2016-08-22 16:16:06 +0200 |
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committer | Martin Odersky <odersky@gmail.com> | 2016-08-26 11:13:16 +0200 |
commit | 8f5bd779903d5c9f29bc3750391ffacbf3cf869e (patch) | |
tree | bb5cea499f596ca419de557fc1b0c0e9639745f7 /tests/pos/gadts2.scala | |
parent | 23d1bfb4111d8aff513659f2b3e3dd695b9b6e03 (diff) | |
download | dotty-8f5bd779903d5c9f29bc3750391ffacbf3cf869e.tar.gz dotty-8f5bd779903d5c9f29bc3750391ffacbf3cf869e.tar.bz2 dotty-8f5bd779903d5c9f29bc3750391ffacbf3cf869e.zip |
GADT test
This one failed in getters before because a (previously unchecked) assignment
was turned into a checked application. Now it passes.
Diffstat (limited to 'tests/pos/gadts2.scala')
-rw-r--r-- | tests/pos/gadts2.scala | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/tests/pos/gadts2.scala b/tests/pos/gadts2.scala new file mode 100644 index 000000000..71089c0f7 --- /dev/null +++ b/tests/pos/gadts2.scala @@ -0,0 +1,25 @@ +object Test { + + abstract class Number + case class MyInt(n: Int) extends Number + case class MyDouble(d: Double) extends Number + + trait Term[a] + case class Cell[a](var x: a) extends Term[a] + final case class NumTerm(val n: Number) extends Term[Number] + + def f[A](t: Term[A], c: Cell[A]): Unit = { + t match { + case NumTerm(n) => c.x = MyDouble(1.0) // problem is: this assignment is not type correct, since gadt variable is forgotten + } + } + + val x: Term[Number] = NumTerm(MyInt(5)) + + def main(args: Array[String]): Unit = { + val cell = Cell[Number](MyInt(6)) + Console.println(cell) + f[Number](new NumTerm(MyInt(5)), cell) + Console.println(cell) + } +} |