replace 'trait' keyword with 'interface' in user-visible messages and code generation tools

compiler/testData/diagnostics/tests/cyclicHierarchy/cyclicHierarchy.txt

@@ -10,34 +10,34 @@ internal val g: G? = null
 internal val h: H? = null
 internal fun test(): kotlin.Unit
 
-internal trait A {
+internal interface A {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     internal open fun foo(): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-internal trait B : A {
+internal interface B : A {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     internal open override /*1*/ /*fake_override*/ fun foo(): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-internal trait C {
+internal interface C {
 }
 
-internal trait D {
+internal interface D {
 }
 
-internal trait E {
+internal interface E {
 }
 
-internal trait F {
+internal interface F {
 }
 
-internal trait G : F {
+internal interface G : F {
 }
 
-internal trait H : F {
+internal interface H : F {
 }

compiler/testData/diagnostics/tests/cyclicHierarchy/javaKotlinJavaCycle.txt

@@ -1,16 +1,16 @@
 package
 
-public/*package*/ trait A : C {
+public/*package*/ interface A : C {
     internal abstract override /*1*/ /*fake_override*/ fun bar(): kotlin.Unit
     public abstract override /*1*/ /*fake_override*/ fun baz(): kotlin.Unit
     public abstract fun foo(): kotlin.Unit
 }
 
-internal trait B {
+internal interface B {
     internal abstract fun bar(): kotlin.Unit
 }
 
-public/*package*/ trait C : B {
+public/*package*/ interface C : B {
     internal abstract override /*1*/ /*fake_override*/ fun bar(): kotlin.Unit
     public abstract fun baz(): kotlin.Unit
 }

compiler/testData/diagnostics/tests/cyclicHierarchy/kotlinJavaNestedCycle.txt

@@ -1,13 +1,13 @@
 package
 
-internal trait ExceptionTracker {
+internal interface ExceptionTracker {
 }
 
 public/*package*/ open class LockBasedStorageManager : StorageManager {
     public/*package*/ constructor LockBasedStorageManager()
     java.lang.Override() public/*package*/ open override /*1*/ fun foo(): kotlin.Unit
 
-    public/*package*/ trait ExceptionHandlingStrategy {
+    public/*package*/ interface ExceptionHandlingStrategy {
         public abstract fun bar(): kotlin.Unit
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
@@ -18,6 +18,6 @@ public/*package*/ open class LockBasedStorageManager : StorageManager {
     public/*package*/ final /*synthesized*/ fun ExceptionHandlingStrategy(/*0*/ function: () -> kotlin.Unit): LockBasedStorageManager.ExceptionHandlingStrategy
 }
 
-internal trait StorageManager {
+internal interface StorageManager {
     internal abstract fun foo(): kotlin.Unit
 }