Kapt3: Generate empty body for constructor and void methods

plugins/kapt3/src/org/jetbrains/kotlin/kapt3/JCTreeConverter.kt

@@ -126,7 +126,8 @@ class JCTreeConverter(context: Context, val classes: List<ClassNode>, val origin
         if (isSynthetic(method.access)) return null
 
         val modifiers = convertModifiers(method.access, ElementKind.METHOD, method.visibleAnnotations, method.invisibleAnnotations)
-        val name = if (method.name == "<init>") containingClassSimpleName else name(method.name)
+        val isConstructor = method.name == "<init>"
+        val name = if (isConstructor) containingClassSimpleName else name(method.name)
         val typeParameters = JavacList.nil<JCTypeParameter>()
         val receiverParameter = null
 
@@ -147,6 +148,8 @@ class JCTreeConverter(context: Context, val classes: List<ClassNode>, val origin
 
         val body = if (defaultValue != null) {
             null
+        } else if (isConstructor || returnType == Type.VOID_TYPE) {
+            treeMaker.Block(0, JavacList.nil())
         } else {
             val returnStatement = treeMaker.Return(convertLiteralExpression(getDefaultValue(returnType)))
             treeMaker.Block(0, JavacList.of(returnStatement))

plugins/kapt3/testData/converter/dataClass.kt

@@ -1 +1,3 @@
-data class User(val firstName: String, val secondName: String, val age: Int)
+data class User(val firstName: String, val secondName: String, val age: Int) {
+    fun procedure() {}
+}

plugins/kapt3/testData/converter/dataClass.txt

@@ -3,6 +3,9 @@ public final class User {
     private final java.lang.String secondName;
     private final int age;
 
+    public final void procedure() {
+    }
+
     public final java.lang.String getFirstName() {
         return null;
     }
@@ -16,7 +19,6 @@ public final class User {
     }
 
     public void User(java.lang.String firstName, java.lang.String secondName, int age) {
-        return null;
     }
 
     public final java.lang.String component1() {