Have "in type" for java fields to be able to check that type in assignment positions (against rhs' type)

^KT-46727 Fixed

core/descriptors/src/org/jetbrains/kotlin/descriptors/PropertyDescriptor.java

@@ -18,6 +18,7 @@ package org.jetbrains.kotlin.descriptors;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.types.KotlinType;
 import org.jetbrains.kotlin.types.TypeSubstitutor;
 
 import java.util.Collection;
@@ -65,4 +66,7 @@ public interface PropertyDescriptor extends VariableDescriptorWithAccessors, Cal
     @NotNull
     @Override
     CopyBuilder<? extends PropertyDescriptor> newCopyBuilder();
+
+    @Nullable
+    KotlinType getInType();
 }

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

@@ -108,6 +108,15 @@ public class PropertyDescriptorImpl extends VariableDescriptorWithInitializerImp
                                           isExpect, isActual, isExternal, isDelegated);
     }
 
+    public void setInType(@NotNull KotlinType inType) {
+        /* Do nothing as the corresponding setter is generated by default */
+    }
+
+    @Override
+    public KotlinType getInType() {
+        return setter != null ? setter.getValueParameters().get(0).getType() : null;
+    }
+
     public void setType(
             @NotNull KotlinType outType,
             @ReadOnly @NotNull List<? extends TypeParameterDescriptor> typeParameters,
@@ -400,6 +409,12 @@ public class PropertyDescriptorImpl extends VariableDescriptorWithInitializerImp
             return null; // TODO : tell the user that the property was projected out
         }
 
+        KotlinType inType = substitutor.substitute(originalOutType, Variance.IN_VARIANCE);
+
+        if (inType != null) {
+            substitutedDescriptor.setInType(inType);
+        }
+
         ReceiverParameterDescriptor substitutedDispatchReceiver;
         ReceiverParameterDescriptor dispatchReceiver = copyConfiguration.dispatchReceiverParameter;
         if (dispatchReceiver != null) {