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Harden IDE: Avoid ClassCastException in ThisType.cls #4381

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Apr 26, 2018
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Harden IDE: Avoid ClassCastException in ThisType.cls #4381

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6 changes: 5 additions & 1 deletion compiler/src/dotty/tools/dotc/core/Types.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2177,7 +2177,11 @@ object Types {
* do not survive runs whereas typerefs do.
*/
abstract case class ThisType(tref: TypeRef) extends CachedProxyType with SingletonType {
def cls(implicit ctx: Context): ClassSymbol = tref.stableInRunSymbol.asClass
def cls(implicit ctx: Context): ClassSymbol = tref.stableInRunSymbol match {
case cls: ClassSymbol => cls
case _ if ctx.mode.is(Mode.Interactive) => defn.AnyClass // was observed to happen in IDE mode
}

override def underlying(implicit ctx: Context): Type =
if (ctx.erasedTypes) tref
else cls.info match {
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