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-rw-r--r--src/dotty/tools/dotc/Run.scala1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/dotty/tools/dotc/Run.scala b/src/dotty/tools/dotc/Run.scala
index 114f994be..ba86e3e70 100644
--- a/src/dotty/tools/dotc/Run.scala
+++ b/src/dotty/tools/dotc/Run.scala
@@ -50,6 +50,7 @@ class Run(comp: Compiler)(implicit ctx: Context) {
}
protected def compileUnits() = Stats.monitorHeartBeat {
+ ctx.checkSingleThreaded()
val phases = ctx.squashPhases(ctx.phasePlan,
ctx.settings.Yskip.value, ctx.settings.YstopBefore.value, ctx.settings.YstopAfter.value, ctx.settings.Ycheck.value)
ctx.usePhases(phases)