remove prepend

engine/runtime/src/main/java/org/enso/interpreter/node/callable/IndirectInvokeConversionNode.java

@@ -156,7 +156,7 @@ Object doWarning(
             argumentsExecutionMode,
             isTail,
             thatArgumentPosition);
-    return WithWarnings.prependTo(result, warnings);
+    return WithWarnings.appendTo(result, warnings);
   }
 
   @Specialization(guards = "interop.isString(that)")

engine/runtime/src/main/java/org/enso/interpreter/node/callable/IndirectInvokeMethodNode.java

@@ -134,7 +134,7 @@ Object doWarning(
             argumentsExecutionMode,
             isTail,
             thisArgumentPosition);
-    return WithWarnings.prependTo(result, warnings);
+    return WithWarnings.appendTo(result, warnings);
   }
 
   @Specialization

engine/runtime/src/main/java/org/enso/interpreter/node/callable/InvokeCallableNode.java

@@ -297,7 +297,7 @@ public Object invokeWarnings(
       if (result instanceof DataflowError) {
         return result;
       } else if (result instanceof WithWarnings withWarnings) {
-        return withWarnings.prepend(extracted);
+        return withWarnings.append(extracted);
       } else {
         return WithWarnings.wrap(result, extracted);
       }

engine/runtime/src/main/java/org/enso/interpreter/node/callable/InvokeConversionNode.java

@@ -175,7 +175,7 @@ Object doWarning(
     ArrayRope<Warning> warnings = that.getReassignedWarningsAsRope(this);
     Object result =
         childDispatch.execute(frame, state, conversion, self, that.getValue(), arguments);
-    return WithWarnings.prependTo(result, warnings);
+    return WithWarnings.appendTo(result, warnings);
   }
 
   @Specialization(guards = "interop.isString(that)")

engine/runtime/src/main/java/org/enso/interpreter/node/callable/InvokeMethodNode.java

@@ -275,7 +275,7 @@ Object doWarning(
     arguments[thisArgumentPosition] = selfWithoutWarnings;
 
     Object result = childDispatch.execute(frame, state, symbol, selfWithoutWarnings, arguments);
-    return WithWarnings.prependTo(result, arrOfWarnings);
+    return WithWarnings.appendTo(result, arrOfWarnings);
   }
 
   @ExplodeLoop
@@ -327,7 +327,7 @@ Object doPolyglot(
     Object res = hostMethodCallNode.execute(polyglotCallType, symbol.getName(), self, args);
     if (anyWarnings) {
       anyWarningsProfile.enter();
-      res = WithWarnings.prependTo(res, accumulatedWarnings);
+      res = WithWarnings.appendTo(res, accumulatedWarnings);
     }
     return res;
   }

engine/runtime/src/main/java/org/enso/interpreter/runtime/error/Warning.java

@@ -74,7 +74,7 @@ public Array getReassignments() {
   @Builtin.Specialize
   public static WithWarnings attach(
       EnsoContext ctx, WithWarnings value, Object warning, Object origin) {
-    return value.prepend(new Warning(warning, origin, ctx.clockTick()));
+    return value.append(new Warning(warning, origin, ctx.clockTick()));
   }
 
   @Builtin.Method(

engine/runtime/src/main/java/org/enso/interpreter/runtime/error/WithWarnings.java

@@ -37,12 +37,6 @@ private WithWarnings(Object value, EconomicSet<Warning> warnings, Warning... add
     this.value = value;
   }
 
-  private WithWarnings(Object value, EconomicSet<Warning> warnings, EconomicSet<Warning> additionalWarnings) {
-    assert !(value instanceof WithWarnings);
-    this.warnings = cloneSetAndAppend(warnings, additionalWarnings);
-    this.value = value;
-  }
-
   public static WithWarnings wrap(Object value, Warning... warnings) {
     if (value instanceof WithWarnings with) {
       return with.append(warnings);
@@ -59,12 +53,8 @@ public WithWarnings append(Warning... newWarnings) {
     return new WithWarnings(value, warnings, newWarnings);
   }
 
-  public WithWarnings prepend(ArrayRope<Warning> newWarnings) {
-    return new WithWarnings(value, createSetFromArray(newWarnings.toArray(Warning[]::new)), warnings);
-  }
-
-  public WithWarnings prepend(Warning... newWarnings) {
-    return new WithWarnings(value, createSetFromArray(newWarnings), warnings);
+  public WithWarnings append(ArrayRope<Warning> newWarnings) {
+    return new WithWarnings(value, warnings, newWarnings.toArray(Warning[]::new));
   }
 
   public Warning[] getWarningsArray(WarningsLibrary warningsLibrary) {
@@ -116,22 +106,6 @@ public static WithWarnings appendTo(Object target, Warning[] warnings) {
     }
   }
 
-  public static WithWarnings prependTo(Object target, ArrayRope<Warning> warnings) {
-    if (target instanceof WithWarnings) {
-      return ((WithWarnings) target).prepend(warnings);
-    } else {
-      return new WithWarnings(target, warnings.toArray(Warning[]::new));
-    }
-  }
-
-  public static WithWarnings prependTo(Object target, Warning[] warnings) {
-    if (target instanceof WithWarnings) {
-      return ((WithWarnings) target).prepend(warnings);
-    } else {
-      return new WithWarnings(target, warnings);
-    }
-  }
-
   @ExportMessage
   Object send(Message message, Object[] args, @CachedLibrary(limit = "3") ReflectionLibrary lib)
       throws Exception {
@@ -199,15 +173,6 @@ private EconomicSet<Warning> cloneSetAndAppend(EconomicSet<Warning> initial, War
     return set;
   }
 
-  @CompilerDirectives.TruffleBoundary
-  @SuppressWarnings("unchecked")
-  private EconomicSet<Warning> cloneSetAndAppend(EconomicSet<Warning> initial, EconomicSet<Warning> entries) {
-    EconomicSet<Warning> set = EconomicSet.create(new WarningEquivalence());
-    set.addAll(initial.iterator());
-    set.addAll(entries.iterator());
-    return set;
-  }
-
   @Override
   public String toString() {
     return "WithWarnings{" + value + " + " + warnings.size() + " warnings}";