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author | Paul Phillips <paulp@improving.org> | 2010-10-05 15:34:37 +0000 |
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committer | Paul Phillips <paulp@improving.org> | 2010-10-05 15:34:37 +0000 |
commit | 7553e6901d52ace00bfcb670336c480766c8301c (patch) | |
tree | 720e9fa758661c6d5cc51340b4b693433d00d696 /test/files/neg | |
parent | a4cf7b1ec5dade69b41e59469b9b3f65415b9822 (diff) | |
download | scala-7553e6901d52ace00bfcb670336c480766c8301c.tar.gz scala-7553e6901d52ace00bfcb670336c480766c8301c.tar.bz2 scala-7553e6901d52ace00bfcb670336c480766c8301c.zip |
Improves exhaustiveness analysis to not warn ab...
Improves exhaustiveness analysis to not warn about types which cannot
match due to nonconformant type parameters. Also, look at the different
warnings emitted in the test case based on the presence of a constraint.
Nifty! Closes #3683, no review.
Diffstat (limited to 'test/files/neg')
-rw-r--r-- | test/files/neg/bug3683a.check | 6 | ||||
-rw-r--r-- | test/files/neg/bug3683a.flags | 1 | ||||
-rw-r--r-- | test/files/neg/bug3683a.scala | 20 | ||||
-rw-r--r-- | test/files/neg/bug3683b.check | 6 | ||||
-rw-r--r-- | test/files/neg/bug3683b.scala | 21 | ||||
-rw-r--r-- | test/files/neg/exhausting.check | 9 | ||||
-rw-r--r-- | test/files/neg/exhausting.scala | 7 |
7 files changed, 67 insertions, 3 deletions
diff --git a/test/files/neg/bug3683a.check b/test/files/neg/bug3683a.check new file mode 100644 index 0000000000..a1c5b9c56d --- /dev/null +++ b/test/files/neg/bug3683a.check @@ -0,0 +1,6 @@ +bug3683a.scala:14: error: match is not exhaustive! +missing combination XX + + w match { + ^ +one error found diff --git a/test/files/neg/bug3683a.flags b/test/files/neg/bug3683a.flags new file mode 100644 index 0000000000..85d8eb2ba2 --- /dev/null +++ b/test/files/neg/bug3683a.flags @@ -0,0 +1 @@ +-Xfatal-warnings diff --git a/test/files/neg/bug3683a.scala b/test/files/neg/bug3683a.scala new file mode 100644 index 0000000000..6d1915213a --- /dev/null +++ b/test/files/neg/bug3683a.scala @@ -0,0 +1,20 @@ +sealed trait Foo +sealed trait Bar extends Foo +sealed trait W[T >: Bar <: Foo] +case class X() extends W[Foo] +case class XX() extends W[Bar] +case class Y() extends W[Bar] +case class Z[T >: Bar <: Foo]( + z1: W[T] +) extends W[T] + +object Main { + // should warn for not including XX() + def f1(w: W[Bar]): Int = { + w match { + // case XX() => 2 + case Y() => 1 + case Z(z) => f1(z) + } + } +}
\ No newline at end of file diff --git a/test/files/neg/bug3683b.check b/test/files/neg/bug3683b.check new file mode 100644 index 0000000000..3952633d1d --- /dev/null +++ b/test/files/neg/bug3683b.check @@ -0,0 +1,6 @@ +bug3683b.scala:15: error: constructor cannot be instantiated to expected type; + found : X + required: W[Bar] + case X() => 1 + ^ +one error found diff --git a/test/files/neg/bug3683b.scala b/test/files/neg/bug3683b.scala new file mode 100644 index 0000000000..646e418121 --- /dev/null +++ b/test/files/neg/bug3683b.scala @@ -0,0 +1,21 @@ +sealed trait Foo +sealed trait Bar extends Foo +sealed trait W[T >: Bar <: Foo] +case class X() extends W[Foo] +case class XX() extends W[Bar] +case class Y() extends W[Bar] +case class Z[T >: Bar <: Foo]( + z1: W[T] +) extends W[T] + +object Main { + // should fail for including X() + def f1(w: W[Bar]): Int = { + w match { + case X() => 1 + case XX() => 2 + case Y() => 1 + case Z(z) => f1(z) + } + } +}
\ No newline at end of file diff --git a/test/files/neg/exhausting.check b/test/files/neg/exhausting.check index 6383a6eaca..d3f2251f79 100644 --- a/test/files/neg/exhausting.check +++ b/test/files/neg/exhausting.check @@ -14,11 +14,16 @@ missing combination Bar3 def fail3[T](x: Foo[T]) = x match { ^ exhausting.scala:31: error: match is not exhaustive! +missing combination Bar2 Bar2 + + def fail4[T <: AnyRef](xx: (Foo[T], Foo[T])) = xx match { + ^ +exhausting.scala:36: error: match is not exhaustive! missing combination Bar1 Bar2 missing combination Bar1 Bar3 missing combination Bar2 Bar1 missing combination Bar2 Bar2 - def fail4[T](xx: (Foo[T], Foo[T])) = xx match { + def fail5[T](xx: (Foo[T], Foo[T])) = xx match { ^ -four errors found +5 errors found diff --git a/test/files/neg/exhausting.scala b/test/files/neg/exhausting.scala index 8b1ea817e4..0741d7467b 100644 --- a/test/files/neg/exhausting.scala +++ b/test/files/neg/exhausting.scala @@ -28,7 +28,12 @@ object Test { case Bar1 => "ok" case Bar2 => "ok" } - def fail4[T](xx: (Foo[T], Foo[T])) = xx match { + def fail4[T <: AnyRef](xx: (Foo[T], Foo[T])) = xx match { + case (Bar1, Bar1) => () + case (Bar2, Bar3) => () + case (Bar3, _) => () + } + def fail5[T](xx: (Foo[T], Foo[T])) = xx match { case (Bar1, Bar1) => () case (Bar2, Bar3) => () case (Bar3, _) => () |