Find usages and reference to delegation origin

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitImplThroughDelegate.0.kt

@@ -0,0 +1,11 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages, skipImports
+package server
+
+trait TraitWithImpl {
+    fun <caret>foo() = 1
+}
+
+public class TraitWithDelegatedWithImpl(f: TraitWithImpl): TraitWithImpl by f
+
+fun test(twdwi: TraitWithDelegatedWithImpl) = twdwi.foo()

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitImplThroughDelegate.1.java

@@ -0,0 +1,9 @@
+package client;
+
+import server.TraitWithDelegatedWithImpl;
+
+public class Test {
+    public static void bar(TraitWithDelegatedWithImpl some) {
+        some.foo();
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitImplThroughDelegate.results.txt

@@ -0,0 +1,2 @@
+Function call (11: 53) fun test(twdwi: TraitWithDelegatedWithImpl) = twdwi.foo()
+Unclassified usage (7: 14) some.foo();

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitNoImplThroughDelegate.0.kt

@@ -0,0 +1,11 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages, skipImports
+package server
+
+trait TraitNoImpl {
+    fun <caret>foo()
+}
+
+public class TraitWithDelegatedNoImpl(f: TraitNoImpl): TraitNoImpl by f
+
+fun test(twdni: TraitWithDelegatedNoImpl) = twdni.foo()

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitNoImplThroughDelegate.1.java

@@ -0,0 +1,9 @@
+package client;
+
+import server.TraitWithDelegatedNoImpl;
+
+public class JClient {
+    public static void bar(TraitWithDelegatedNoImpl some) {
+        some.foo();
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitNoImplThroughDelegate.results.txt

@@ -0,0 +1,2 @@
+Function call (11: 51) fun test(twdni: TraitWithDelegatedNoImpl) = twdni.foo()
+Unclassified usage (7: 14) some.foo();

idea/testData/resolve/referenceInJava/DelegatedMethodFromTraitNoImpl.java

@@ -0,0 +1,9 @@
+import k.*;
+
+public class Test {
+    public static void bar(TraitWithDelegatedNoImpl some) {
+        some.<caret>foo();
+    }
+}
+
+// REF: (in k.TraitNoImpl).foo()

idea/testData/resolve/referenceInJava/DelegatedMethodFromTraitWithImpl.java

@@ -0,0 +1,9 @@
+import k.*;
+
+public class Test {
+    public static void bar(TraitWithDelegatedWithImpl some) {
+        some.<caret>foo();
+    }
+}
+
+// REF: (in k.TraitWithImpl).foo()

idea/testData/resolve/referenceInJava/dependencies.kt

@@ -39,4 +39,12 @@ object PlatformStaticFun {
 
 trait TraitNoImpl {
     fun foo()
-}
+}
+
+public class TraitWithDelegatedNoImpl(f: TraitNoImpl): TraitNoImpl by f
+
+trait TraitWithImpl {
+    fun foo() = 1
+}
+
+public class TraitWithDelegatedWithImpl(f: TraitWithImpl): TraitWithImpl by f