diff options
Diffstat (limited to 'src/dotty/tools/dotc/core/Denotations.scala')
| -rw-r--r-- | src/dotty/tools/dotc/core/Denotations.scala | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/dotty/tools/dotc/core/Denotations.scala b/src/dotty/tools/dotc/core/Denotations.scala index f9c4fde8f..77ae86fd6 100644 --- a/src/dotty/tools/dotc/core/Denotations.scala +++ b/src/dotty/tools/dotc/core/Denotations.scala @@ -331,7 +331,9 @@ object Denotations { // --------------- DenotationSets ------------------------------------------------- - /** A DenotationSet represents a set of denotation */ + /** A DenotationSet represents a set of single denotations + * It is used as an optimization to avoid forming MultiDenotations too eagerly. + */ trait DenotationSet { def exists: Boolean def toDenot(implicit ctx: Context): Denotation @@ -348,7 +350,7 @@ object Denotations { } case class DenotUnion(denots1: DenotationSet, denots2: DenotationSet) extends DenotationSet { - assert(denots1.exists && !denots2.exists) + assert(denots1.exists && denots2.exists) private def derivedUnion(s1: DenotationSet, s2: DenotationSet) = if (!s1.exists) s2 else if (!s2.exists) s1 |