FIR: set dispatch receiver for backing field access

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/TowerLevels.kt

@@ -144,7 +144,7 @@ class MemberScopeTowerLevel(
 // We can access here members of currently accessible scope which is not influenced by explicit receiver
 // We can either have no explicit receiver at all, or it can be an extension receiver
 // An explicit receiver never can be a dispatch receiver at this level
-// So: dispatch receiver = strictly none (EXCEPTION: importing scopes with import from objects)
+// So: dispatch receiver = strictly none (EXCEPTIONS: importing scopes with import from objects, synthetic field variable)
 // So: extension receiver = either none or explicit
 // (if explicit receiver exists, it always *should* be an extension receiver)
 class ScopeTowerLevel(
@@ -169,8 +169,12 @@ class ScopeTowerLevel(
         return when (token) {
             TowerScopeLevel.Token.Properties -> scope.processPropertiesByName(name) { candidate ->
                 if (candidate.hasConsistentReceivers(extensionReceiver)) {
+                    val dispatchReceiverValue = when (candidate) {
+                        is FirBackingFieldSymbol -> candidate.fir.symbol.dispatchReceiverValue()
+                        else -> null
+                    }
                     processor.consumeCandidate(
-                        candidate as T, dispatchReceiverValue = null,
+                        candidate as T, dispatchReceiverValue = dispatchReceiverValue,
                         implicitExtensionReceiverValue = implicitExtensionReceiver
                     )
                 } else {

compiler/fir/resolve/testData/resolve/localObject.txt

@@ -45,7 +45,7 @@ FILE: localObject.kt
 
                 }
 
-                F|/TestProperty.x| = R|<local>/value|
+                D|this@R|/TestProperty||.F|/TestProperty.x| = R|<local>/value|
             }
 
         public final val y: R|kotlin/Int|

compiler/testData/ir/irText/classes/initVar.fir.txt

@@ -102,6 +102,7 @@ FILE fqName:<root> fileName:/initVar.kt
     ANONYMOUS_INITIALIZER isStatic=false
       BLOCK_BODY
         SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:public' type=kotlin.Unit origin=null
+          receiver: GET_VAR '<this>: <root>.TestInitVarInInitBlock declared in <root>.TestInitVarInInitBlock' type=<root>.TestInitVarInInitBlock origin=null
           value: CONST Int type=kotlin.Int value=0
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean
       overridden:
@@ -139,6 +140,7 @@ FILE fqName:<root> fileName:/initVar.kt
         VALUE_PARAMETER name:value index:0 type:kotlin.Int
         BLOCK_BODY
           SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:public' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.TestInitVarWithCustomSetter declared in <root>.TestInitVarWithCustomSetter' type=<root>.TestInitVarWithCustomSetter origin=null
             value: GET_VAR 'value: kotlin.Int declared in <root>.TestInitVarWithCustomSetter.<set-x>' type=kotlin.Int origin=null
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean
       overridden:
@@ -170,10 +172,12 @@ FILE fqName:<root> fileName:/initVar.kt
         VALUE_PARAMETER name:value index:0 type:kotlin.Int
         BLOCK_BODY
           SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:public' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.TestInitVarWithCustomSetterWithExplicitCtor declared in <root>.TestInitVarWithCustomSetterWithExplicitCtor' type=<root>.TestInitVarWithCustomSetterWithExplicitCtor origin=null
             value: GET_VAR 'value: kotlin.Int declared in <root>.TestInitVarWithCustomSetterWithExplicitCtor.<set-x>' type=kotlin.Int origin=null
     ANONYMOUS_INITIALIZER isStatic=false
       BLOCK_BODY
         SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:public' type=kotlin.Unit origin=null
+          receiver: GET_VAR '<this>: <root>.TestInitVarWithCustomSetterWithExplicitCtor declared in <root>.TestInitVarWithCustomSetterWithExplicitCtor' type=<root>.TestInitVarWithCustomSetterWithExplicitCtor origin=null
           value: CONST Int type=kotlin.Int value=0
     CONSTRUCTOR visibility:public <> () returnType:<root>.TestInitVarWithCustomSetterWithExplicitCtor
       BLOCK_BODY
@@ -209,10 +213,12 @@ FILE fqName:<root> fileName:/initVar.kt
         VALUE_PARAMETER name:value index:0 type:kotlin.Int
         BLOCK_BODY
           SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:public' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.TestInitVarWithCustomSetterInCtor declared in <root>.TestInitVarWithCustomSetterInCtor' type=<root>.TestInitVarWithCustomSetterInCtor origin=null
             value: GET_VAR 'value: kotlin.Int declared in <root>.TestInitVarWithCustomSetterInCtor.<set-x>' type=kotlin.Int origin=null
     CONSTRUCTOR visibility:public <> () returnType:<root>.TestInitVarWithCustomSetterInCtor
       BLOCK_BODY
         SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:kotlin.Int visibility:public' type=kotlin.Unit origin=null
+          receiver: GET_VAR '<this>: <root>.TestInitVarWithCustomSetterInCtor declared in <root>.TestInitVarWithCustomSetterInCtor' type=<root>.TestInitVarWithCustomSetterInCtor origin=null
           value: CONST Int type=kotlin.Int value=42
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:TestInitVarWithCustomSetterInCtor modality:FINAL visibility:public superTypes:[kotlin.Any]'