NI: do substitution stub types during updating trace for lambda (these stub types can appear from the builder inference as postponed variables)

^KT-40060 Fixed

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/VariableDescriptorImpl.java

@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.descriptors.annotations.Annotations;
 import org.jetbrains.kotlin.name.Name;
 import org.jetbrains.kotlin.types.KotlinType;
+import org.jetbrains.kotlin.types.StubType;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -49,7 +50,7 @@ public abstract class VariableDescriptorImpl extends DeclarationDescriptorNonRoo
     }
 
     public void setOutType(KotlinType outType) {
-        assert this.outType == null;
+        assert this.outType == null || this.outType instanceof StubType;
         this.outType = outType;
     }