Callable references handled

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/usagesSearch/destructuringDeclarationUsages.kt

@@ -314,6 +314,19 @@ private class Processor(
                             return true // companion object member or static member access - ignore it
                         }
                     }
+
+                    is KtCallableReferenceExpression -> {
+                        when (element) {
+                            parent.receiverExpression -> { // usage in receiver of callable reference (before "::") - ignore it
+                                return true
+                            }
+
+                            parent.callableReference -> { // usage after "::" in callable reference - should be reference to constructor of our data class
+                                processSuspiciousExpression(element)
+                                return true
+                            }
+                        }
+                    }
                 }
 
                 if (element.getStrictParentOfType<KtImportDirective>() != null) return true // ignore usage in import

idea/testData/findUsages/kotlin/conventions/components/callableReferences.0.kt

@@ -0,0 +1,24 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtParameter
+// OPTIONS: usages
+
+data class A(val <caret>a: Int, val b: Int) {
+    fun f() {}
+}
+
+fun f1(): A = A(1, 2)
+
+class X {
+    fun f2() = A(0, 0)
+}
+
+fun foo(x: X) {
+    val fun1 = A::f
+
+    val fun2 = ::f1
+    val fun3 = x::f2
+    val (a1, b1) = fun2()
+    val (a2, b2) = fun3()
+
+    val constructor = ::A
+    val (a3, b3) = constructor(1, 2)
+}

idea/testData/findUsages/kotlin/conventions/components/callableReferences.log

@@ -0,0 +1,16 @@
+Checked type of (a1, b1)
+Checked type of (a2, b2)
+Checked type of (a3, b3)
+Checked type of X.f2()
+Checked type of constructor
+Checked type of fun2
+Checked type of fun3
+Searched inheritors of A
+Searched references to A
+Searched references to X.f2() in Kotlin files
+Searched references to constructor in Kotlin files
+Searched references to f1() in Kotlin files
+Searched references to fun2 in Kotlin files
+Searched references to fun3 in Kotlin files
+Used plain search in LocalSearchScope:
+    CLASS:A

idea/testData/findUsages/kotlin/conventions/components/callableReferences.results.txt

@@ -0,0 +1,3 @@
+Value read 19 val (a1, b1) = fun2()
+Value read 20 val (a2, b2) = fun3()
+Value read 23 val (a3, b3) = constructor(1, 2)

idea/tests/org/jetbrains/kotlin/findUsages/FindUsagesTestGenerated.java

@@ -170,6 +170,12 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                     KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/findUsages/kotlin/conventions/components"), Pattern.compile("^(.+)\\.0\\.kt$"), true);
                 }
 
+                @TestMetadata("callableReferences.0.kt")
+                public void testCallableReferences() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/conventions/components/callableReferences.0.kt");
+                    doTest(fileName);
+                }
+
                 @TestMetadata("companionObjectAccess.0.kt")
                 public void testCompanionObjectAccess() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/conventions/components/companionObjectAccess.0.kt");