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-rw-r--r--src/dotty/tools/dotc/core/Denotations.scala3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/core/Denotations.scala b/src/dotty/tools/dotc/core/Denotations.scala
index 494df7547..09971d1d1 100644
--- a/src/dotty/tools/dotc/core/Denotations.scala
+++ b/src/dotty/tools/dotc/core/Denotations.scala
@@ -601,7 +601,8 @@ object Denotations {
*/
private def bringForward()(implicit ctx: Context): SingleDenotation = this match {
case denot: SymDenotation if ctx.stillValid(denot) =>
- assert(ctx.runId > validFor.runId, s"denotation $denot invalid in run ${ctx.runId}. ValidFor: $validFor")
+ assert(ctx.runId > validFor.runId || ctx.settings.YtestPickler.value, // mixing test pickler with debug printing can travel back in time
+ s"denotation $denot invalid in run ${ctx.runId}. ValidFor: $validFor")
var d: SingleDenotation = denot
do {
d.validFor = Period(ctx.period.runId, d.validFor.firstPhaseId, d.validFor.lastPhaseId)