diff options
Diffstat (limited to 'src/dotty/tools/dotc/core/TypeComparer.scala')
| -rw-r--r-- | src/dotty/tools/dotc/core/TypeComparer.scala | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/dotty/tools/dotc/core/TypeComparer.scala b/src/dotty/tools/dotc/core/TypeComparer.scala index f468a573f..592f2c5de 100644 --- a/src/dotty/tools/dotc/core/TypeComparer.scala +++ b/src/dotty/tools/dotc/core/TypeComparer.scala @@ -199,7 +199,7 @@ class TypeComparer(initctx: Context) extends DotClass with ConstraintHandling { } compareWild case tp2: LazyRef => - isSubType(tp1, tp2.ref) + !tp2.evaluating && isSubType(tp1, tp2.ref) case tp2: AnnotatedType => isSubType(tp1, tp2.tpe) // todo: refine? case tp2: ThisType => @@ -299,7 +299,10 @@ class TypeComparer(initctx: Context) extends DotClass with ConstraintHandling { } compareWild case tp1: LazyRef => - isSubType(tp1.ref, tp2) + // If `tp1` is in train of being evaluated, don't force it + // because that would cause an assertionError. Return false instead. + // See i859.scala for an example where we hit this case. + !tp1.evaluating && isSubType(tp1.ref, tp2) case tp1: AnnotatedType => isSubType(tp1.tpe, tp2) case AndType(tp11, tp12) => |