[kotlin] unused symbol: disable for parameters of anonymous functions

- it's not cheap to check if the function has an explicit expected type, k1 ignored parameters anyway

^KTIJ-35651 fixed

GitOrigin-RevId: b1798d0a67e14fbf4abb798168be71848b86d549

plugins/kotlin/code-insight/inspections-k2/tests/test/org/jetbrains/kotlin/idea/k2/inspections/tests/K2UnusedSymbolHighlightingTestGenerated.java

@@ -202,6 +202,16 @@ public abstract class K2UnusedSymbolHighlightingTestGenerated extends AbstractK2
             runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/annotationWithUseSiteTarget.kt");
         }
 
+        @TestMetadata("anonymousFunction.kt")
+        public void testAnonymousFunction() throws Exception {
+            runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/anonymousFunction.kt");
+        }
+
+        @TestMetadata("anonymousFunction1.kt")
+        public void testAnonymousFunction1() throws Exception {
+            runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/anonymousFunction1.kt");
+        }
+
         @TestMetadata("arrayAccessOperator.kt")
         public void testArrayAccessOperator() throws Exception {
             runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/arrayAccessOperator.kt");

plugins/kotlin/highlighting/highlighting-k2/src/org/jetbrains/kotlin/idea/highlighting/K2UnusedSymbolUtil.kt

@@ -103,6 +103,9 @@ object K2UnusedSymbolUtil {
                     if (isExpectedOrActual(containingClass)) return false
                 }
             } else if (ownerFunction is KtFunction) {
+                if (ownerFunction.name == null) {
+                    return false
+                }
                 if (ownerFunction.hasModifier(KtTokens.OPERATOR_KEYWORD)) {
                     // operator parameters are hardcoded to be used since they can't be removed at will, because operator convention would break
                     return false

plugins/kotlin/idea/tests/test/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -16610,6 +16610,16 @@ public abstract class LocalInspectionTestGenerated extends AbstractLocalInspecti
                 runTest("testData/inspectionsLocal/unusedSymbol/annotationWithUseSiteTarget.kt");
             }
 
+            @TestMetadata("anonymousFunction.kt")
+            public void testAnonymousFunction() throws Exception {
+                runTest("testData/inspectionsLocal/unusedSymbol/anonymousFunction.kt");
+            }
+
+            @TestMetadata("anonymousFunction1.kt")
+            public void testAnonymousFunction1() throws Exception {
+                runTest("testData/inspectionsLocal/unusedSymbol/anonymousFunction1.kt");
+            }
+
             @TestMetadata("arrayAccessOperator.kt")
             public void testArrayAccessOperator() throws Exception {
                 runTest("testData/inspectionsLocal/unusedSymbol/arrayAccessOperator.kt");

plugins/kotlin/idea/tests/testData/inspectionsLocal/unusedSymbol/anonymousFunction.kt

@@ -0,0 +1,13 @@
+// PROBLEM: none
+// WITH_STDLIB
+fun foo(p: (String) -> Unit) {
+    p("")
+}
+
+fun use() {
+    foo(
+        fun(i<caret>t: String) {
+            print("foo")
+        },
+    )
+}

plugins/kotlin/idea/tests/testData/inspectionsLocal/unusedSymbol/anonymousFunction1.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+// WITH_STDLIB
+fun use() {
+    val f = fun(i<caret>t: String) {
+       print("foo")
+    }
+}