Add check to inlined method

Author: felixmulder

src/dotty/tools/dotc/typer/Inliner.scala

@@ -375,8 +375,11 @@ class Inliner(call: tpd.Tree, rhs: tpd.Tree)(implicit ctx: Context) {
     case _ =>
   }
 
+  /** If the rhs has errors we should not inline it */
+  private def canInline = rhs.hasType && !rhs.tpe.isError
+
   /** The Inlined node representing the inlined call */
-  def inlined(pt: Type) = {
+  def inlined(pt: Type) = if (canInline) {
     // make sure prefix is executed if it is impure
     if (!isIdempotentExpr(prefix)) registerType(meth.owner.thisType)
 
@@ -458,7 +461,7 @@ class Inliner(call: tpd.Tree, rhs: tpd.Tree)(implicit ctx: Context) {
 
       tpd.Inlined(call, bindings, expansion1)
     }
-  }
+  } else rhs
 
   /** An extractor for references to closure arguments that refer to `@inline` methods */
   private object InlineableClosure {