Finding unused properties.

idea/testData/inspections/unusedSymbol/class/usedOnlyInside.kt

@@ -1,3 +1,5 @@
 class A {
-    val x: A? = null
+    {
+        val x: A? = null
+    }
 }

idea/testData/inspections/unusedSymbol/property/classMemberInheritedUsed.kt

@@ -0,0 +1,9 @@
+open class Klass {
+    val used = ":)"
+}
+
+class Subklass: Klass()
+
+fun main(args: Array<String>) {
+    Subklass().used
+}

idea/testData/inspections/unusedSymbol/property/classMemberOverriddenUsed.kt

@@ -0,0 +1,11 @@
+open class Klass {
+    open val used = ":)"
+}
+
+class Subklass: Klass() {
+    override fun used = ":|"
+}
+
+fun main(args: Array<String>) {
+    Subklass().used
+}

idea/testData/inspections/unusedSymbol/property/classMemberOverride.kt

@@ -0,0 +1,12 @@
+trait Trait {
+    val member: String
+}
+
+class Klass: Trait {
+    override val member: String = ":)"
+}
+
+fun main(args: Array<String>) {
+    val t: Trait = Klass()
+    println(t.member)
+}

idea/testData/inspections/unusedSymbol/property/classMemberUnused.kt

@@ -0,0 +1,7 @@
+class Klass {
+    val unused = ":("
+}
+
+fun main(args: Array<String>) {
+    Klass()
+}

idea/testData/inspections/unusedSymbol/property/classMemberUsed.kt

@@ -0,0 +1,7 @@
+class Klass {
+    fun used = ":)"
+}
+
+fun main(args: Array<String>) {
+    Klass().used
+}

idea/testData/inspections/unusedSymbol/property/inspectionData/expected.xml

@@ -0,0 +1,28 @@
+<problems>
+  <problem>
+    <file>topLevelUnused.kt</file>
+    <line>1</line>
+    <module>light_idea_test_case</module>
+    <entry_point TYPE="file" FQNAME="temp:///src/topLevelUnused.kt" />
+    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
+    <description>Property 'unused' is never used</description>
+  </problem>
+
+  <problem>
+    <file>topLevelOnlyInImport.kt</file>
+    <line>5</line>
+    <module>light_idea_test_case</module>
+    <entry_point TYPE="file" FQNAME="temp:///src/topLevelOnlyInImport.kt" />
+    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
+    <description>Property 'onlyInImport' is never used</description>
+  </problem>
+
+  <problem>
+    <file>classMemberUnused.kt</file>
+    <line>2</line>
+    <module>light_idea_test_case</module>
+    <entry_point TYPE="file" FQNAME="temp:///src/classMemberUnused.kt" />
+    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
+    <description>Property 'unused' is never used</description>
+  </problem>
+</problems>

idea/testData/inspections/unusedSymbol/property/inspectionData/inspections.test

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

idea/testData/inspections/unusedSymbol/property/local.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    val local = ":(" // it is unused, but marked by front-end instead of inspection
+}

idea/testData/inspections/unusedSymbol/property/topLevelOnlyInImport.kt

@@ -0,0 +1,5 @@
+package foo
+
+import foo.onlyInImport
+
+val onlyInImport = ":("

idea/testData/inspections/unusedSymbol/property/topLevelUnused.kt

@@ -0,0 +1 @@
+val unused = ":("

idea/testData/inspections/unusedSymbol/property/topLevelUsed.kt

@@ -0,0 +1,5 @@
+fun used = ":)"
+
+fun main(args: Array<String>) {
+    println(used)
+}