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| author | Martin Odersky <odersky@gmail.com> | 2016-12-02 18:37:28 +0100 |
|---|---|---|
| committer | Martin Odersky <odersky@gmail.com> | 2016-12-02 18:39:36 +0100 |
| commit | 306c31214b8f729b810d1f162da20ff8ca6a2848 (patch) | |
| tree | bdfcd4c55151463e1b2ddae4413d6f8ea69e38b3 /compiler/src/dotty/tools/dotc/core/TypeOps.scala | |
| parent | 47d208448e614125446c7f294f8231c3fb7108d6 (diff) | |
| download | dotty-306c31214b8f729b810d1f162da20ff8ca6a2848.tar.gz dotty-306c31214b8f729b810d1f162da20ff8ca6a2848.tar.bz2 dotty-306c31214b8f729b810d1f162da20ff8ca6a2848.zip | |
Fix #1751: Make dominator work after erasure
i1751.scala shows a case where we need to compute the approximation
of an or-type during erasure. This can lead to an empty set of common
classes because Any does not exist anymore after erasure.
Diffstat (limited to 'compiler/src/dotty/tools/dotc/core/TypeOps.scala')
| -rw-r--r-- | compiler/src/dotty/tools/dotc/core/TypeOps.scala | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/core/TypeOps.scala b/compiler/src/dotty/tools/dotc/core/TypeOps.scala index 92e5f9d57..39214dd0c 100644 --- a/compiler/src/dotty/tools/dotc/core/TypeOps.scala +++ b/compiler/src/dotty/tools/dotc/core/TypeOps.scala @@ -197,6 +197,9 @@ trait TypeOps { this: Context => // TODO: Make standalone object. case c :: rest => val accu1 = if (accu exists (_ derivesFrom c)) accu else c :: accu if (cs == c.baseClasses) accu1 else dominators(rest, accu1) + case Nil => // this case can happen because after erasure we do not have a top class anymore + assert(ctx.erasedTypes) + defn.ObjectClass :: Nil } def mergeRefined(tp1: Type, tp2: Type): Type = { |