Fix exception during resolution of incorrect fun interface

#KT-37541 Fixed

compiler/fir/analysis-tests/tests/org/jetbrains/kotlin/fir/FirOldFrontendDiagnosticsTestGenerated.java

@@ -7954,6 +7954,11 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirOldFronte
             runTest("compiler/testData/diagnostics/tests/funInterface/genericSubstitutionForFunInterface.kt");
         }
 
+        @TestMetadata("resolveFunInterfaceWithoutMainMethod.kt")
+        public void testResolveFunInterfaceWithoutMainMethod() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/funInterface/resolveFunInterfaceWithoutMainMethod.kt");
+        }
+
         @TestMetadata("severalConversionsForFunInterface.kt")
         public void testSeveralConversionsForFunInterface() throws Exception {
             runTest("compiler/testData/diagnostics/tests/funInterface/severalConversionsForFunInterface.kt");

compiler/testData/diagnostics/tests/funInterface/resolveFunInterfaceWithoutMainMethod.fir.kt

@@ -0,0 +1,12 @@
+fun interface IsolatedFunFace {
+}
+
+typealias FunAlias = IsolatedFunFace
+
+fun referIsolatedFunFace(iff: IsolatedFunFace) {}
+
+fun callIsolatedFunFace() {
+    referIsolatedFunFace(<!UNRESOLVED_REFERENCE!>IsolatedFunFace<!> {})
+    referIsolatedFunFace(<!UNRESOLVED_REFERENCE!>FunAlias<!> {})
+    <!INAPPLICABLE_CANDIDATE!>referIsolatedFunFace<!>({})
+}

compiler/testData/diagnostics/tests/funInterface/resolveFunInterfaceWithoutMainMethod.kt

@@ -0,0 +1,12 @@
+<!FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS!>fun<!> interface IsolatedFunFace {
+}
+
+typealias FunAlias = IsolatedFunFace
+
+fun referIsolatedFunFace(<!UNUSED_PARAMETER!>iff<!>: IsolatedFunFace) {}
+
+fun callIsolatedFunFace() {
+    referIsolatedFunFace(<!RESOLUTION_TO_CLASSIFIER!>IsolatedFunFace<!> {})
+    referIsolatedFunFace(<!RESOLUTION_TO_CLASSIFIER!>FunAlias<!> {})
+    referIsolatedFunFace(<!TYPE_MISMATCH!>{}<!>)
+}

compiler/testData/diagnostics/tests/funInterface/resolveFunInterfaceWithoutMainMethod.txt

@@ -0,0 +1,11 @@
+package
+
+public fun callIsolatedFunFace(): kotlin.Unit
+public fun referIsolatedFunFace(/*0*/ iff: IsolatedFunFace): kotlin.Unit
+
+public fun interface IsolatedFunFace {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+public typealias FunAlias = IsolatedFunFace

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -7961,6 +7961,11 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTestWithFirVali
                 runTest("compiler/testData/diagnostics/tests/funInterface/genericSubstitutionForFunInterface.kt");
             }
 
+            @TestMetadata("resolveFunInterfaceWithoutMainMethod.kt")
+            public void testResolveFunInterfaceWithoutMainMethod() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/funInterface/resolveFunInterfaceWithoutMainMethod.kt");
+            }
+
             @TestMetadata("severalConversionsForFunInterface.kt")
             public void testSeveralConversionsForFunInterface() throws Exception {
                 runTest("compiler/testData/diagnostics/tests/funInterface/severalConversionsForFunInterface.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsUsingJavacTestGenerated.java

@@ -7956,6 +7956,11 @@ public class DiagnosticsUsingJavacTestGenerated extends AbstractDiagnosticsUsing
                 runTest("compiler/testData/diagnostics/tests/funInterface/genericSubstitutionForFunInterface.kt");
             }
 
+            @TestMetadata("resolveFunInterfaceWithoutMainMethod.kt")
+            public void testResolveFunInterfaceWithoutMainMethod() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/funInterface/resolveFunInterfaceWithoutMainMethod.kt");
+            }
+
             @TestMetadata("severalConversionsForFunInterface.kt")
             public void testSeveralConversionsForFunInterface() throws Exception {
                 runTest("compiler/testData/diagnostics/tests/funInterface/severalConversionsForFunInterface.kt");

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/synthetic/FunInterfaceConstructorsSyntheticScope.kt

@@ -58,21 +58,26 @@ class FunInterfaceConstructorsSyntheticScope(
             return getTypeAliasSamConstructor(classifier)
         }
 
-        if (classifier !is ClassDescriptor) return null
+        val classDescriptor = checkIfClassifierApplicable(classifier) ?: return null
-        if (!classifier.isFun) return null
+        return samConstructorForClassifier(classDescriptor)
-
-        return samConstructorForClassifier(classifier)
     }
 
     private fun getTypeAliasSamConstructor(classifier: TypeAliasDescriptor): SamConstructorDescriptor? {
-        val classDescriptor = classifier.classDescriptor ?: return null
+        val classDescriptor = checkIfClassifierApplicable(classifier.classDescriptor ?: return null) ?: return null
-        if (!classDescriptor.isFun) return null
 
         return createTypeAliasSamConstructorFunction(
             classifier, samConstructorForClassifier(classDescriptor), samResolver, samConversionOracle
         )
     }
 
+    private fun checkIfClassifierApplicable(classifier: ClassifierDescriptor): ClassDescriptor? {
+        if (classifier !is ClassDescriptor) return null
+        if (!classifier.isFun) return null
+        if (getSingleAbstractMethodOrNull(classifier) == null) return null
+
+        return classifier
+    }
+
     private fun recordSamLookupsToClassifier(classifier: ClassifierDescriptor, location: LookupLocation) {
         if (classifier !is ClassDescriptor || !classifier.isFun) return
         lookupTracker.record(location, classifier, SAM_LOOKUP_NAME)