Prohibit secondary constructors in traits

compiler/frontend/src/org/jetbrains/kotlin/resolve/LazyTopDownAnalyzer.java

@@ -36,9 +36,7 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
-import static org.jetbrains.kotlin.diagnostics.Errors.MANY_DEFAULT_OBJECTS;
+import static org.jetbrains.kotlin.diagnostics.Errors.*;
-import static org.jetbrains.kotlin.diagnostics.Errors.SECONDARY_CONSTRUCTOR_IN_OBJECT;
-import static org.jetbrains.kotlin.diagnostics.Errors.UNSUPPORTED;
 
 public class LazyTopDownAnalyzer {
     private BindingTrace trace;
@@ -206,6 +204,9 @@ public class LazyTopDownAnalyzer {
                                     if (DescriptorUtils.isSingletonOrAnonymousObject(classDescriptor)) {
                                         trace.report(SECONDARY_CONSTRUCTOR_IN_OBJECT.on((JetSecondaryConstructor) jetDeclaration));
                                     }
+                                    else if (classDescriptor.getKind() == ClassKind.TRAIT) {
+                                        trace.report(CONSTRUCTOR_IN_TRAIT.on(jetDeclaration));
+                                    }
                                 }
                             }
                         }

compiler/testData/diagnostics/tests/secondaryConstructors/constructorInTrait.kt

@@ -0,0 +1,3 @@
+trait A {
+    <!CONSTRUCTOR_IN_TRAIT!>constructor() {}<!>
+}

compiler/testData/diagnostics/tests/secondaryConstructors/constructorInTrait.txt

@@ -0,0 +1,7 @@
+package
+
+internal trait A {
+    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
+}

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

@@ -10421,6 +10421,12 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("constructorInTrait.kt")
+            public void testConstructorInTrait() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/constructorInTrait.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("cyclicDelegationCalls.kt")
             public void testCyclicDelegationCalls() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/secondaryConstructors/cyclicDelegationCalls.kt");