FIC: Introduce isFun property for descriptors and proto

core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassDescriptor.kt

@@ -95,6 +95,7 @@ class FunctionClassDescriptor(
     override fun isInner() = false
     override fun isData() = false
     override fun isInline() = false
+    override fun isFun() = false
     override fun isExpect() = false
     override fun isActual() = false
     override fun isExternal() = false

core/descriptors/src/org/jetbrains/kotlin/descriptors/ClassDescriptor.java

@@ -70,6 +70,8 @@ public interface ClassDescriptor extends ClassifierDescriptorWithTypeParameters,
 
     boolean isInline();
 
+    boolean isFun();
+
     @NotNull
     ReceiverParameterDescriptor getThisAsReceiverParameter();
 

core/descriptors/src/org/jetbrains/kotlin/descriptors/NotFoundClasses.kt

@@ -69,6 +69,7 @@ class NotFoundClasses(private val storageManager: StorageManager, private val mo
         override fun isCompanionObject() = false
         override fun isData() = false
         override fun isInline() = false
+        override fun isFun() = false
         override fun isExpect() = false
         override fun isActual() = false
         override fun isExternal() = false

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/ClassDescriptorImpl.java

@@ -144,6 +144,11 @@ public class ClassDescriptorImpl extends ClassDescriptorBase {
         return false;
     }
 
+    @Override
+    public boolean isFun() {
+        return false;
+    }
+
     @Override
     public boolean isInner() {
         return false;

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/EnumEntrySyntheticClassDescriptor.java

@@ -138,6 +138,11 @@ public class EnumEntrySyntheticClassDescriptor extends ClassDescriptorBase {
         return false;
     }
 
+    @Override
+    public boolean isFun() {
+        return false;
+    }
+
     @Override
     public boolean isCompanionObject() {
         return false;

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/LazySubstitutingClassDescriptor.java

@@ -243,6 +243,11 @@ public class LazySubstitutingClassDescriptor extends ModuleAwareClassDescriptor
         return original.isInline();
     }
 
+    @Override
+    public boolean isFun() {
+        return original.isFun();
+    }
+
     @Override
     public boolean isExternal() {
         return original.isExternal();

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/MutableClassDescriptor.java

@@ -99,6 +99,11 @@ public class MutableClassDescriptor extends ClassDescriptorBase {
         return false;
     }
 
+    @Override
+    public boolean isFun() {
+        return false;
+    }
+
     @Override
     public boolean isCompanionObject() {
         return false;