KT-12152 : leaking this inspection: accessing non-final member / this in non-final class

idea/testData/inspections/leakingThis/inspectionData/expected.xml

@@ -0,0 +1,26 @@
+<problems>
+    <problem>
+        <file>test.kt</file>
+        <line>18</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/test.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Leaking 'this' in constructor</problem_class>
+        <description>Leaking 'this' in constructor of non-final class Second</description>
+    </problem>
+    <problem>
+        <file>test.kt</file>
+        <line>20</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/test.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Leaking 'this' in constructor</problem_class>
+        <description>Calling non-final function foo in constructor</description>
+    </problem>
+    <problem>
+        <file>test.kt</file>
+        <line>40</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/test.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Leaking 'this' in constructor</problem_class>
+        <description>Accessing non-final property x in constructor</description>
+    </problem>
+</problems>

idea/testData/inspections/leakingThis/inspectionData/inspections.test

@@ -0,0 +1 @@
+// INSPECTION_CLASS: org.jetbrains.kotlin.idea.inspections.LeakingThisInspection

idea/testData/inspections/leakingThis/test.kt

@@ -0,0 +1,56 @@
+class First {
+    val x: String
+
+    init {
+        use(this) // NPE! Leaking this
+        x = foo() // NPE! Own function
+    }
+
+    fun foo() = x
+}
+
+fun use(first: First) = first.x.hashCode()
+
+abstract class Second {
+    val x: String
+
+    init {
+        use(this) // Leaking this in non-final
+        x = bar() // Own function in non-final
+        foo()     // Non-final function call
+    }
+
+    private fun bar() = foo()
+
+    abstract fun foo(): String
+}
+
+fun use(second: Second) = second.x
+
+class SecondDerived : Second() {
+    val y = x // null!
+
+    override fun foo() = y
+}
+
+open class Third {
+    open var x: String
+
+    constructor() {
+        x = "X" // Non-final property access
+    }
+}
+
+class ThirdDerived : Third() {
+    override var x: String = "Y"
+        set(arg) { field = "$arg$y" }
+
+    val y = ""
+}
+
+class Fourth {
+    val x: String
+        get() = y
+
+    val y = x // null!
+}