FIR checker: report VAL_REASSIGNMENT_VIA_BACKING_FIELD(_ERROR)

compiler/testData/diagnostics/tests/backingField/FieldReassignment_after.fir.kt

@@ -1,7 +0,0 @@
-// !LANGUAGE: +RestrictionOfValReassignmentViaBackingField
-
-val my: Int = 1
-    get() {
-        field++
-        return field
-    }

compiler/testData/diagnostics/tests/backingField/FieldReassignment_after.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +RestrictionOfValReassignmentViaBackingField
 
 val my: Int = 1

compiler/testData/diagnostics/tests/backingField/FieldReassignment_before.fir.kt

@@ -1,7 +0,0 @@
-// !LANGUAGE: -RestrictionOfValReassignmentViaBackingField
-
-val my: Int = 1
-    get() {
-        field++
-        return field
-    }

compiler/testData/diagnostics/tests/backingField/FieldReassignment_before.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: -RestrictionOfValReassignmentViaBackingField
 
 val my: Int = 1

compiler/testData/diagnostics/tests/backingField/LocalDeclarations.kt

@@ -0,0 +1,35 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +RestrictionOfValReassignmentViaBackingField
+
+class Outer {
+    val i: Int = 1
+        get() {
+            class Inner {
+                var i: Int = 2
+                    get() {
+                        field++
+                        return field
+                    }
+                val j: Int = 3
+                    get() {
+                        <!VAL_REASSIGNMENT_VIA_BACKING_FIELD_ERROR!>field<!> = 42
+                        return field
+                    }
+
+                fun innerMember() {
+                    <!VAL_REASSIGNMENT_VIA_BACKING_FIELD_ERROR!>field<!>++
+                }
+            }
+            return field
+        }
+
+    val j: Int = 4
+        get() {
+            fun local() {
+                <!VAL_REASSIGNMENT_VIA_BACKING_FIELD_ERROR!>field<!>++
+                field++
+            }
+            local()
+            return field
+        }
+}

compiler/testData/diagnostics/tests/backingField/LocalDeclarations.txt

@@ -0,0 +1,10 @@
+package
+
+public final class Outer {
+    public constructor Outer()
+    public final val i: kotlin.Int = 1
+    public final val j: kotlin.Int = 4
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}