DFA: only stable values or qualified with stable receiver can be bound in x = y #KT-15792 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/LocalVariableResolver.kt

@@ -30,6 +30,7 @@ import org.jetbrains.kotlin.psi.KtPsiUtil
 import org.jetbrains.kotlin.psi.KtVariableDeclaration
 import org.jetbrains.kotlin.resolve.calls.context.ContextDependency
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
+import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValue
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactory
 import org.jetbrains.kotlin.resolve.calls.util.isSingleUnderscore
 import org.jetbrains.kotlin.resolve.lazy.ForceResolveUtil
@@ -98,7 +99,7 @@ class LocalVariableResolver(
             val type = typeInfo.type
             if (type != null) {
                 val initializerDataFlowValue = DataFlowValueFactory.createDataFlowValue(initializer, type, context)
-                if (!propertyDescriptor.isVar) {
+                if (!propertyDescriptor.isVar && initializerDataFlowValue.canBeBound) {
                     context.trace.record(BindingContext.BOUND_INITIALIZER_VALUE, propertyDescriptor, initializerDataFlowValue)
                 }
                 // At this moment we do not take initializer value into account if type is given for a property

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/DataFlowValue.kt

@@ -69,6 +69,8 @@ class DataFlowValue(val identifierInfo: IdentifierInfo,
      */
     val isStable = (kind == Kind.STABLE_VALUE || kind == Kind.STABLE_VARIABLE || kind == Kind.STABLE_COMPLEX_EXPRESSION)
 
+    val canBeBound get() = identifierInfo.canBeBound
+
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (other !is DataFlowValue) return false

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/IdentifierInfo.kt

@@ -27,6 +27,8 @@ interface IdentifierInfo {
 
     val kind: DataFlowValue.Kind get() = OTHER
 
+    val canBeBound get() = false
+
     object NO : IdentifierInfo {
         override fun toString() = "NO_IDENTIFIER_INFO"
     }
@@ -45,6 +47,9 @@ interface IdentifierInfo {
             val bound: DataFlowValue?
     ) : IdentifierInfo {
 
+        override val canBeBound
+            get() = kind == STABLE_VALUE
+
         override fun equals(other: Any?) = other is Variable && variable == other.variable
 
         override fun hashCode() = variable.hashCode()
@@ -74,6 +79,9 @@ interface IdentifierInfo {
     ) : IdentifierInfo {
         override val kind: DataFlowValue.Kind get() = if (receiverInfo.kind == STABLE_VALUE) selectorInfo.kind else OTHER
 
+        override val canBeBound
+            get() = receiverInfo.canBeBound
+
         override fun equals(other: Any?) = other is Qualified && receiverInfo == other.receiverInfo && selectorInfo == other.selectorInfo
 
         override fun hashCode() = 31 * receiverInfo.hashCode() + selectorInfo.hashCode()