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author | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
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committer | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
commit | 9ef5f6817688f814a3450126aa7383b0928e80a0 (patch) | |
tree | 5727a2f7f7fd665cefdb312af2785c692f04377c /tests/untried/neg/tcpoly_typealias.scala | |
parent | 194be919664447631ba55446eb4874979c908d27 (diff) | |
download | dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.gz dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.bz2 dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.zip |
add tests from scala/test/files/{pos,neg}
with explicit Unit return type
Diffstat (limited to 'tests/untried/neg/tcpoly_typealias.scala')
-rw-r--r-- | tests/untried/neg/tcpoly_typealias.scala | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/tests/untried/neg/tcpoly_typealias.scala b/tests/untried/neg/tcpoly_typealias.scala new file mode 100644 index 000000000..6c7f80cc0 --- /dev/null +++ b/tests/untried/neg/tcpoly_typealias.scala @@ -0,0 +1,47 @@ +trait A { + type m[+x] +} + +trait A2 { + type m[+x <: String] +} + +trait A3 { + type m[x] +} + +trait FooCov[+x] +trait FooCon[-x] +trait FooBound[+x <: String] + +trait BOk1 extends A { + type m[+x] = FooCov[x] +} + +trait BOk2 extends A2 { + type m[+x <: String] = FooBound[x] +} + +trait BOk3 extends A2 { + type m[+x] = FooCov[x] // weaker bound +} + +trait BOk4 extends A3 { + type m[+x] = FooCov[x] // weaker variance +} + +// there are two aspects to check: + // does type alias signature (not considering RHS) correspond to abstract type member in super class + // does RHS correspond to the type alias sig +trait BInv extends A{ + type m[x] = FooCov[x] // error: invariant x in alias def +} + +trait BCon extends A{ + type m[-x] = FooCon[x] // error: contravariant x +} + +trait BBound extends A{ + type m[+x <: String] = FooBound[x] // error: x with stricter bound +} + |