K2: don't resolve callable reference to enum entries #KT-59611 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -11062,6 +11062,12 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 runTest("compiler/testData/diagnostics/tests/enum/overrideFinalEnumMethods.kt");
             }
 
+            @Test
+            @TestMetadata("referenceToEnumEntry.kt")
+            public void testReferenceToEnumEntry() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.kt");
+            }
+
             @Test
             @TestMetadata("SecondaryConstructorCall.kt")
             public void testSecondaryConstructorCall() throws Exception {

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -11062,6 +11062,12 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 runTest("compiler/testData/diagnostics/tests/enum/overrideFinalEnumMethods.kt");
             }
 
+            @Test
+            @TestMetadata("referenceToEnumEntry.kt")
+            public void testReferenceToEnumEntry() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.kt");
+            }
+
             @Test
             @TestMetadata("SecondaryConstructorCall.kt")
             public void testSecondaryConstructorCall() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java

@@ -11062,6 +11062,12 @@ public class FirLightTreeOldFrontendDiagnosticsTestGenerated extends AbstractFir
                 runTest("compiler/testData/diagnostics/tests/enum/overrideFinalEnumMethods.kt");
             }
 
+            @Test
+            @TestMetadata("referenceToEnumEntry.kt")
+            public void testReferenceToEnumEntry() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.kt");
+            }
+
             @Test
             @TestMetadata("SecondaryConstructorCall.kt")
             public void testSecondaryConstructorCall() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java

@@ -11068,6 +11068,12 @@ public class FirPsiOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiDia
                 runTest("compiler/testData/diagnostics/tests/enum/overrideFinalEnumMethods.kt");
             }
 
+            @Test
+            @TestMetadata("referenceToEnumEntry.kt")
+            public void testReferenceToEnumEntry() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.kt");
+            }
+
             @Test
             @TestMetadata("SecondaryConstructorCall.kt")
             public void testSecondaryConstructorCall() throws Exception {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/CandidateFactory.kt

@@ -83,11 +83,20 @@ class CandidateFactory private constructor(
         )
 
         // The counterpart in FE 1.0 checks if the given descriptor is VariableDescriptor yet not PropertyDescriptor.
-        // Here, we explicitly check if the referred declaration/symbol is value parameter, local variable, or backing field.
+        // Here, we explicitly check if the referred declaration/symbol is value parameter, local variable, enum entry, or backing field.
         val callSite = callInfo.callSite
         if (callSite is FirCallableReferenceAccess) {
-            if (symbol is FirValueParameterSymbol || symbol is FirPropertySymbol && symbol.isLocal || symbol is FirBackingFieldSymbol) {
+            when {
-                result.addDiagnostic(Unsupported("References to variables aren't supported yet", callSite.calleeReference.source))
+                symbol is FirValueParameterSymbol || symbol is FirPropertySymbol && symbol.isLocal || symbol is FirBackingFieldSymbol -> {
+                    result.addDiagnostic(
+                        Unsupported("References to variables aren't supported yet", callSite.calleeReference.source)
+                    )
+                }
+                symbol is FirEnumEntrySymbol -> {
+                    result.addDiagnostic(
+                        Unsupported("References to enum entries aren't supported", callSite.calleeReference.source)
+                    )
+                }
             }
         } else if (objectsByName && symbol.isRegularClassWithoutCompanion(callInfo.session)) {
             result.addDiagnostic(NoCompanionObject)

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/calls/ResolutionDiagnostic.kt

@@ -123,7 +123,7 @@ class InfixCallOfNonInfixFunction(val function: FirNamedFunctionSymbol) : Resolu
 class OperatorCallOfNonOperatorFunction(val function: FirNamedFunctionSymbol) : ResolutionDiagnostic(CONVENTION_ERROR)
 
 class InferenceError(val constraintError: ConstraintSystemError) : ResolutionDiagnostic(constraintError.applicability)
-class Unsupported(val message: String, val source: KtSourceElement? = null) : ResolutionDiagnostic(K2_UNSUPPORTED)
+class Unsupported(val message: String, val source: KtSourceElement?) : ResolutionDiagnostic(K2_UNSUPPORTED)
 
 object PropertyAsOperator : ResolutionDiagnostic(K2_PROPERTY_AS_OPERATOR)
 

compiler/testData/codegen/box/enum/enumEntriesNameClashes.kt

@@ -1,6 +1,5 @@
-// !LANGUAGE: +EnumEntries
+// !LANGUAGE: +EnumEntries -PrioritizedEnumEntries
 // KT-59611
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
 // IGNORE_BACKEND: JS, JVM
 // WITH_STDLIB
 

compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.fir.kt

@@ -0,0 +1,5 @@
+enum class My { V }
+
+fun test() {
+    val ref = My::<!UNSUPPORTED!>V<!>
+}

compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.kt

@@ -0,0 +1,5 @@
+enum class My { V }
+
+fun test() {
+    val ref = My::<!UNRESOLVED_REFERENCE!>V<!>
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java

@@ -11068,6 +11068,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/enum/overrideFinalEnumMethods.kt");
             }
 
+            @Test
+            @TestMetadata("referenceToEnumEntry.kt")
+            public void testReferenceToEnumEntry() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/enum/referenceToEnumEntry.kt");
+            }
+
             @Test
             @TestMetadata("SecondaryConstructorCall.kt")
             public void testSecondaryConstructorCall() throws Exception {