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author | Jason Zaugg <jzaugg@gmail.com> | 2013-02-25 11:37:14 +0100 |
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committer | Jason Zaugg <jzaugg@gmail.com> | 2013-02-25 11:37:14 +0100 |
commit | de1f74990aa5321a47dd1366a1e283f2ca8a4e6f (patch) | |
tree | c2cc775b4aef6206694bb303fc1bb81e864c40d2 | |
parent | 9a2455aee4cfb09030ff2c2c0e6861326487e474 (diff) | |
download | scala-de1f74990aa5321a47dd1366a1e283f2ca8a4e6f.tar.gz scala-de1f74990aa5321a47dd1366a1e283f2ca8a4e6f.tar.bz2 scala-de1f74990aa5321a47dd1366a1e283f2ca8a4e6f.zip |
SI-7180 Fix regression in implicit scope of HK type alias.
We actually need to call normalize here, otherwise we don't
progress through #1 below.
[infer implicit] scala.this.Predef.implicitly[Higher[Foo.Bar]] with pt=Higher[Foo.Bar] in object Foo
1. tp=Foo.Bar tp.normalize=[A <: <?>]Foo.Bar[A] tp.dealias=Foo.Bar
2. tp=Foo.Bar[A] tp.normalize=Box[A] tp.dealias=Box[A]
-rw-r--r-- | src/compiler/scala/tools/nsc/typechecker/Implicits.scala | 2 | ||||
-rw-r--r-- | test/files/pos/t7180.scala | 13 |
2 files changed, 14 insertions, 1 deletions
diff --git a/src/compiler/scala/tools/nsc/typechecker/Implicits.scala b/src/compiler/scala/tools/nsc/typechecker/Implicits.scala index d1cf9b1904..3bea049c59 100644 --- a/src/compiler/scala/tools/nsc/typechecker/Implicits.scala +++ b/src/compiler/scala/tools/nsc/typechecker/Implicits.scala @@ -1015,7 +1015,7 @@ trait Implicits { args foreach (getParts(_)) } } else if (sym.isAliasType) { - getParts(tp.dealias) + getParts(tp.normalize) // SI-7180 Normalize needed to expand HK type refs } else if (sym.isAbstractType) { getParts(tp.bounds.hi) } diff --git a/test/files/pos/t7180.scala b/test/files/pos/t7180.scala new file mode 100644 index 0000000000..15582f6df3 --- /dev/null +++ b/test/files/pos/t7180.scala @@ -0,0 +1,13 @@ +trait Higher[F[_]] + +trait Box[A] +object Box { + implicit def HigherBox = new Higher[Box] {} +} + +object Foo { + val box = implicitly[Higher[Box]] // compiles fine !!! + + type Bar[A] = Box[A] + val bar = implicitly[Higher[Bar]] // <-- this doesn't compile in 2.10.1-RC1, but does in 2.10.0 !!! +} |