fixed some exception catching problems on wasm target

lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/CmdRuntime.kt

@@ -3663,7 +3663,11 @@ class CmdGetIndex(
         val target = frame.storedSlotObj(targetSlot)
         val index = frame.storedSlotObj(indexSlot)
         if (target is ObjList && target::class == ObjList::class && index is ObjInt) {
-            frame.storeObjResult(dst, target.getObjAtFast(index.toInt()))
+            val i = index.toInt()
+            objListBoundsViolationMessageOrNull(target.sizeFast(), i)?.let {
+                frame.ensureScope().raiseIndexOutOfBounds(it)
+            }
+            frame.storeObjResult(dst, target.getObjAtFast(i))
             return
         }
         val result = target.getAt(frame.ensureScope(), index)
@@ -3682,7 +3686,11 @@ class CmdSetIndex(
         val index = frame.storedSlotObj(indexSlot)
         val value = frame.slotToObj(valueSlot)
         if (target is ObjList && target::class == ObjList::class && index is ObjInt) {
-            target.setObjAtFast(index.toInt(), value)
+            val i = index.toInt()
+            objListBoundsViolationMessageOrNull(target.sizeFast(), i)?.let {
+                frame.ensureScope().raiseIndexOutOfBounds(it)
+            }
+            target.setObjAtFast(i, value)
             return
         }
         target.putAt(frame.ensureScope(), index, value)
@@ -3699,6 +3707,9 @@ class CmdGetIndexInt(
         val target = frame.storedSlotObj(targetSlot)
         val index = frame.getInt(indexSlot).toInt()
         if (target is ObjList && target::class == ObjList::class) {
+            objListBoundsViolationMessageOrNull(target.sizeFast(), index)?.let {
+                frame.ensureScope().raiseIndexOutOfBounds(it)
+            }
             target.getIntAtFast(index)?.let {
                 frame.setInt(dst, it)
                 return
@@ -3722,6 +3733,9 @@ class CmdSetIndexInt(
         val target = frame.storedSlotObj(targetSlot)
         val index = frame.getInt(indexSlot).toInt()
         if (target is ObjList && target::class == ObjList::class) {
+            objListBoundsViolationMessageOrNull(target.sizeFast(), index)?.let {
+                frame.ensureScope().raiseIndexOutOfBounds(it)
+            }
             target.setIntAtFast(index, frame.getInt(valueSlot))
             return
         }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjList.kt

@@ -171,7 +171,9 @@ open class ObjList(initialList: MutableList<Obj> = mutableListOf()) : Obj() {
     override suspend fun getAt(scope: Scope, index: Obj): Obj {
         return when (index) {
             is ObjInt -> {
-                getObjAtFast(index.toInt())
+                val i = index.toInt()
+                objListBoundsViolationMessageOrNull(sizeFast(), i)?.let { scope.raiseIndexOutOfBounds(it) }
+                getObjAtFast(i)
             }
 
             is ObjRange -> {
@@ -209,7 +211,9 @@ open class ObjList(initialList: MutableList<Obj> = mutableListOf()) : Obj() {
     }
 
     open override suspend fun putAt(scope: Scope, index: Obj, newValue: Obj) {
-        setObjAtFast(index.toInt(), newValue)
+        val i = index.toInt()
+        objListBoundsViolationMessageOrNull(sizeFast(), i)?.let { scope.raiseIndexOutOfBounds(it) }
+        setObjAtFast(i, newValue)
     }
 
     override suspend fun compareTo(scope: Scope, other: Obj): Int {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjListBoundsGuard.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyng.obj
+
+internal expect fun objListBoundsViolationMessageOrNull(size: Int, index: Int): String?