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-rw-r--r--src/dotty/tools/dotc/core/Types.scala2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/core/Types.scala b/src/dotty/tools/dotc/core/Types.scala
index bc8d7dfd2..9185c6c63 100644
--- a/src/dotty/tools/dotc/core/Types.scala
+++ b/src/dotty/tools/dotc/core/Types.scala
@@ -986,7 +986,7 @@ object Types {
val prefix: Type
val name: Name
- assert(prefix.isValueType || (prefix eq NoPrefix))
+ assert(prefix.isValueType || (prefix eq NoPrefix), s"invalid prefix $prefix")
private[this] var lastDenotation: Denotation = _
private[this] var lastSymbol: Symbol = _