Prohibit properties with backing fields inside inline classes

compiler/testData/diagnostics/tests/inlineClasses/propertiesWithBackingFieldsInsideInlineClass.kt

@@ -0,0 +1,34 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface A {
+    val goodSize: Int
+}
+
+interface B {
+    val badSize: Int
+}
+
+inline class Foo(val x: Int) : A, B {
+    val a0
+        get() = 0
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>val a1<!> = 0
+
+    var a2: Int
+        get() = 1
+        set(value) {}
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>var a3: Int<!> = 0
+        get() = 1
+        set(value) {
+            field = value
+        }
+
+    override val goodSize: Int
+        get() = 0
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>override val badSize: Int<!> = 0
+
+    <!PROPERTY_WITH_BACKING_FIELD_INSIDE_INLINE_CLASS!>lateinit var lateinitProperty: String<!>
+}