diff --git a/common/space_lua.ts b/common/space_lua.ts
index bcd6a4c7..074c02be 100644
--- a/common/space_lua.ts
+++ b/common/space_lua.ts
@@ -4,6 +4,7 @@ import {
   LuaEnv,
   LuaFunction,
   LuaRuntimeError,
+  LuaStackFrame,
 } from "$common/space_lua/runtime.ts";
 import { parse as parseLua } from "$common/space_lua/parse.ts";
 import { evalStatement } from "$common/space_lua/eval.ts";
@@ -39,10 +40,11 @@ export class SpaceLuaEnvironment {
         const ast = parseLua(script.script, { ref: script.ref });
         // We create a local scope for each script
         const scriptEnv = new LuaEnv(this.env);
-        await evalStatement(ast, scriptEnv);
+        const sf = new LuaStackFrame(new LuaEnv(), ast.ctx);
+        await evalStatement(ast, scriptEnv, sf);
       } catch (e: any) {
         if (e instanceof LuaRuntimeError) {
-          const origin = resolveASTReference(e.context);
+          const origin = resolveASTReference(e.sf.astCtx!);
           if (origin) {
             console.error(
               `Error evaluating script: ${e.message} at [[${origin.page}@${origin.pos}]]`,
@@ -62,7 +64,8 @@ export class SpaceLuaEnvironment {
       if (value instanceof LuaFunction) {
         console.log("Now registering Lua function", globalName);
         scriptEnv.registerFunction({ name: globalName }, (...args: any[]) => {
-          return luaValueToJS(value.call(...args.map(jsToLuaValue)));
+          const sf = new LuaStackFrame(new LuaEnv(), value.body.ctx);
+          return luaValueToJS(value.call(sf, ...args.map(jsToLuaValue)));
         });
       }
     }
diff --git a/common/space_lua/eval.test.ts b/common/space_lua/eval.test.ts
index 086510e7..38a55510 100644
--- a/common/space_lua/eval.test.ts
+++ b/common/space_lua/eval.test.ts
@@ -2,6 +2,7 @@ import { assertEquals } from "@std/assert/equals";
 import {
   LuaEnv,
   LuaNativeJSFunction,
+  LuaStackFrame,
   luaValueToJS,
   singleResult,
 } from "./runtime.ts";
@@ -11,15 +12,19 @@ import { evalExpression, evalStatement } from "./eval.ts";
 import { luaBuildStandardEnv } from "$common/space_lua/stdlib.ts";
 
 function evalExpr(s: string, e = new LuaEnv()): any {
+  const node = parse(`e(${s})`).statements[0] as LuaFunctionCallStatement;
+  const sf = new LuaStackFrame(e, node.ctx);
   return evalExpression(
-    (parse(`e(${s})`).statements[0] as LuaFunctionCallStatement).call
-      .args[0],
+    node.call.args[0],
     e,
+    sf,
   );
 }
 
 function evalBlock(s: string, e = new LuaEnv()): Promise<void> {
-  return evalStatement(parse(s) as LuaBlock, e);
+  const node = parse(s) as LuaBlock;
+  const sf = new LuaStackFrame(e, node.ctx);
+  return evalStatement(node, e, sf);
 }
 
 Deno.test("Evaluator test", async () => {
diff --git a/common/space_lua/eval.ts b/common/space_lua/eval.ts
index f75bf679..762579a3 100644
--- a/common/space_lua/eval.ts
+++ b/common/space_lua/eval.ts
@@ -1,10 +1,15 @@
 import type {
+  ASTCtx,
   LuaExpression,
   LuaLValue,
   LuaStatement,
 } from "$common/space_lua/ast.ts";
 import { evalPromiseValues } from "$common/space_lua/util.ts";
-import { luaCall, luaSet } from "$common/space_lua/runtime.ts";
+import {
+  luaCall,
+  luaSet,
+  type LuaStackFrame,
+} from "$common/space_lua/runtime.ts";
 import {
   type ILuaFunction,
   type ILuaGettable,
@@ -28,6 +33,7 @@ import {
 export function evalExpression(
   e: LuaExpression,
   env: LuaEnv,
+  sf: LuaStackFrame,
 ): Promise<LuaValue> | LuaValue {
   try {
     switch (e.type) {
@@ -41,23 +47,31 @@ export function evalExpression(
         return null;
       case "Binary": {
         const values = evalPromiseValues([
-          evalExpression(e.left, env),
-          evalExpression(e.right, env),
+          evalExpression(e.left, env, sf),
+          evalExpression(e.right, env, sf),
         ]);
         if (values instanceof Promise) {
           return values.then(([left, right]) =>
-            luaOp(e.operator, singleResult(left), singleResult(right))
+            luaOp(
+              e.operator,
+              singleResult(left),
+              singleResult(right),
+              e.ctx,
+              sf,
+            )
           );
         } else {
           return luaOp(
             e.operator,
             singleResult(values[0]),
             singleResult(values[1]),
+            e.ctx,
+            sf,
           );
         }
       }
       case "Unary": {
-        const value = evalExpression(e.argument, env);
+        const value = evalExpression(e.argument, env, sf);
         if (value instanceof Promise) {
           return value.then((value) => {
             switch (e.operator) {
@@ -97,29 +111,30 @@ export function evalExpression(
       case "FunctionCall":
       case "TableAccess":
       case "PropertyAccess":
-        return evalPrefixExpression(e, env);
+        return evalPrefixExpression(e, env, sf);
       case "TableConstructor": {
         const table = new LuaTable();
         const promises: Promise<void>[] = [];
         for (const field of e.fields) {
           switch (field.type) {
             case "PropField": {
-              const value = evalExpression(field.value, env);
+              const value = evalExpression(field.value, env, sf);
               if (value instanceof Promise) {
                 promises.push(value.then((value) => {
                   table.set(
                     field.key,
                     singleResult(value),
+                    sf,
                   );
                 }));
               } else {
-                table.set(field.key, singleResult(value));
+                table.set(field.key, singleResult(value), sf);
               }
               break;
             }
             case "DynamicField": {
-              const key = evalExpression(field.key, env);
-              const value = evalExpression(field.value, env);
+              const key = evalExpression(field.key, env, sf);
+              const value = evalExpression(field.value, env, sf);
               if (
                 key instanceof Promise || value instanceof Promise
               ) {
@@ -131,6 +146,7 @@ export function evalExpression(
                     table.set(
                       singleResult(key),
                       singleResult(value),
+                      sf,
                     );
                   }),
                 );
@@ -138,18 +154,20 @@ export function evalExpression(
                 table.set(
                   singleResult(key),
                   singleResult(value),
+                  sf,
                 );
               }
               break;
             }
             case "ExpressionField": {
-              const value = evalExpression(field.value, env);
+              const value = evalExpression(field.value, env, sf);
               if (value instanceof Promise) {
                 promises.push(value.then((value) => {
                   // +1 because Lua tables are 1-indexed
                   table.set(
                     table.length + 1,
                     singleResult(value),
+                    sf,
                   );
                 }));
               } else {
@@ -157,6 +175,7 @@ export function evalExpression(
                 table.set(
                   table.length + 1,
                   singleResult(value),
+                  sf,
                 );
               }
               break;
@@ -178,7 +197,7 @@ export function evalExpression(
   } catch (err: any) {
     // Repackage any non Lua-specific exceptions with some position information
     if (!err.constructor.name.startsWith("Lua")) {
-      throw new LuaRuntimeError(err.message, e.ctx, err);
+      throw new LuaRuntimeError(err.message, sf.withCtx(e.ctx), err);
     } else {
       throw err;
     }
@@ -188,6 +207,7 @@ export function evalExpression(
 function evalPrefixExpression(
   e: LuaExpression,
   env: LuaEnv,
+  sf: LuaStackFrame,
 ): Promise<LuaValue> | LuaValue {
   switch (e.type) {
     case "Variable": {
@@ -199,43 +219,43 @@ function evalPrefixExpression(
       }
     }
     case "Parenthesized":
-      return evalExpression(e.expression, env);
+      return evalExpression(e.expression, env, sf);
     // <<expr>>[<<expr>>]
     case "TableAccess": {
       const values = evalPromiseValues([
-        evalPrefixExpression(e.object, env),
-        evalExpression(e.key, env),
+        evalPrefixExpression(e.object, env, sf),
+        evalExpression(e.key, env, sf),
       ]);
       if (values instanceof Promise) {
         return values.then(([table, key]) => {
           table = singleResult(table);
           key = singleResult(key);
 
-          return luaGet(table, key, e.ctx);
+          return luaGet(table, key, sf.withCtx(e.ctx));
         });
       } else {
         const table = singleResult(values[0]);
         const key = singleResult(values[1]);
-        return luaGet(table, singleResult(key), e.ctx);
+        return luaGet(table, singleResult(key), sf.withCtx(e.ctx));
       }
     }
     // <expr>.property
     case "PropertyAccess": {
-      const obj = evalPrefixExpression(e.object, env);
+      const obj = evalPrefixExpression(e.object, env, sf);
       if (obj instanceof Promise) {
         return obj.then((obj) => {
-          return luaGet(obj, e.property, e.ctx);
+          return luaGet(obj, e.property, sf.withCtx(e.ctx));
         });
       } else {
-        return luaGet(obj, e.property, e.ctx);
+        return luaGet(obj, e.property, sf.withCtx(e.ctx));
       }
     }
     case "FunctionCall": {
-      let prefixValue = evalPrefixExpression(e.prefix, env);
+      let prefixValue = evalPrefixExpression(e.prefix, env, sf);
       if (!prefixValue) {
         throw new LuaRuntimeError(
           `Attempting to call nil as a function`,
-          e.prefix.ctx,
+          sf.withCtx(e.prefix.ctx),
         );
       }
       if (prefixValue instanceof Promise) {
@@ -243,7 +263,7 @@ function evalPrefixExpression(
           if (!prefixValue) {
             throw new LuaRuntimeError(
               `Attempting to call a nil value`,
-              e.prefix.ctx,
+              sf.withCtx(e.prefix.ctx),
             );
           }
           let selfArgs: LuaValue[] = [];
@@ -251,7 +271,7 @@ function evalPrefixExpression(
           if (e.name && !prefixValue.get) {
             throw new LuaRuntimeError(
               `Attempting to index a non-table: ${prefixValue}`,
-              e.prefix.ctx,
+              sf.withCtx(e.prefix.ctx),
             );
           } else if (e.name) {
             // Two things need to happen: the actual function be called needs to be looked up in the table, and the table itself needs to be passed as the first argument
@@ -261,18 +281,18 @@ function evalPrefixExpression(
           if (!prefixValue.call) {
             throw new LuaRuntimeError(
               `Attempting to call ${prefixValue} as a function`,
-              e.prefix.ctx,
+              sf.withCtx(e.prefix.ctx),
             );
           }
           const args = evalPromiseValues(
-            e.args.map((arg) => evalExpression(arg, env)),
+            e.args.map((arg) => evalExpression(arg, env, sf)),
           );
           if (args instanceof Promise) {
             return args.then((args) =>
-              luaCall(prefixValue, [...selfArgs, ...args], e.ctx)
+              luaCall(prefixValue, [...selfArgs, ...args], e.ctx, sf)
             );
           } else {
-            return luaCall(prefixValue, [...selfArgs, ...args], e.ctx);
+            return luaCall(prefixValue, [...selfArgs, ...args], e.ctx, sf);
           }
         });
       } else {
@@ -281,7 +301,7 @@ function evalPrefixExpression(
         if (e.name && !prefixValue.get) {
           throw new LuaRuntimeError(
             `Attempting to index a non-table: ${prefixValue}`,
-            e.prefix.ctx,
+            sf.withCtx(e.prefix.ctx),
           );
         } else if (e.name) {
           // Two things need to happen: the actual function be called needs to be looked up in the table, and the table itself needs to be passed as the first argument
@@ -291,18 +311,18 @@ function evalPrefixExpression(
         if (!prefixValue.call) {
           throw new LuaRuntimeError(
             `Attempting to call ${prefixValue} as a function`,
-            e.prefix.ctx,
+            sf.withCtx(e.prefix.ctx),
           );
         }
         const args = evalPromiseValues(
-          e.args.map((arg) => evalExpression(arg, env)),
+          e.args.map((arg) => evalExpression(arg, env, sf)),
         );
         if (args instanceof Promise) {
           return args.then((args) =>
-            luaCall(prefixValue, [...selfArgs, ...args], e.ctx)
+            luaCall(prefixValue, [...selfArgs, ...args], e.ctx, sf)
           );
         } else {
-          return luaCall(prefixValue, [...selfArgs, ...args], e.ctx);
+          return luaCall(prefixValue, [...selfArgs, ...args], e.ctx, sf);
         }
       }
     }
@@ -315,7 +335,12 @@ function evalPrefixExpression(
 
 type LuaMetaMethod = Record<string, {
   metaMethod?: string;
-  nativeImplementation: (a: LuaValue, b: LuaValue) => LuaValue;
+  nativeImplementation: (
+    a: LuaValue,
+    b: LuaValue,
+    ctx: ASTCtx,
+    sf: LuaStackFrame,
+  ) => LuaValue;
 }>;
 
 const operatorsMetaMethods: LuaMetaMethod = {
@@ -372,10 +397,10 @@ const operatorsMetaMethods: LuaMetaMethod = {
     nativeImplementation: (a, b) => a <= b,
   },
   ">": {
-    nativeImplementation: (a, b) => !luaOp("<=", a, b),
+    nativeImplementation: (a, b, ctx, sf) => !luaOp("<=", a, b, ctx, sf),
   },
   ">=": {
-    nativeImplementation: (a, b) => !luaOp("<", a, b),
+    nativeImplementation: (a, b, ctx, cf) => !luaOp("<", a, b, ctx, cf),
   },
   and: {
     metaMethod: "__and",
@@ -387,63 +412,59 @@ const operatorsMetaMethods: LuaMetaMethod = {
   },
 };
 
-function luaOp(op: string, left: any, right: any): any {
+function luaOp(
+  op: string,
+  left: any,
+  right: any,
+  ctx: ASTCtx,
+  sf: LuaStackFrame,
+): any {
   const operatorHandler = operatorsMetaMethods[op];
   if (!operatorHandler) {
-    throw new Error(`Unknown operator ${op}`);
+    throw new LuaRuntimeError(`Unknown operator ${op}`, sf.withCtx(ctx));
   }
   if (operatorHandler.metaMethod) {
     if (left?.metatable?.has(operatorHandler.metaMethod)) {
       const fn = left.metatable.get(operatorHandler.metaMethod);
-      if (!fn.call) {
-        throw new Error(
-          `Meta method ${operatorHandler.metaMethod} is not callable`,
-        );
-      } else {
-        return fn.call(left, right);
-      }
+      return luaCall(fn, [left, right], ctx, sf);
     } else if (right?.metatable?.has(operatorHandler.metaMethod)) {
       const fn = right.metatable.get(operatorHandler.metaMethod);
-      if (!fn.call) {
-        throw new Error(
-          `Meta method ${operatorHandler.metaMethod} is not callable`,
-        );
-      } else {
-        return fn.call(right, left);
-      }
+      return luaCall(fn, [left, right], ctx, sf);
     }
   }
-  return operatorHandler.nativeImplementation(left, right);
+  return operatorHandler.nativeImplementation(left, right, ctx, sf);
 }
 
 async function evalExpressions(
   es: LuaExpression[],
   env: LuaEnv,
+  sf: LuaStackFrame,
 ): Promise<LuaValue[]> {
   return new LuaMultiRes(
-    await Promise.all(es.map((e) => evalExpression(e, env))),
+    await Promise.all(es.map((e) => evalExpression(e, env, sf))),
   ).flatten().values;
 }
 
 export async function evalStatement(
   s: LuaStatement,
   env: LuaEnv,
+  sf: LuaStackFrame,
 ): Promise<void> {
   switch (s.type) {
     case "Assignment": {
-      const values = await evalExpressions(s.expressions, env);
+      const values = await evalExpressions(s.expressions, env, sf);
       const lvalues = await evalPromiseValues(s.variables
-        .map((lval) => evalLValue(lval, env)));
+        .map((lval) => evalLValue(lval, env, sf)));
 
       for (let i = 0; i < lvalues.length; i++) {
-        luaSet(lvalues[i].env, lvalues[i].key, values[i], s.ctx);
+        luaSet(lvalues[i].env, lvalues[i].key, values[i], sf.withCtx(s.ctx));
       }
 
       break;
     }
     case "Local": {
       if (s.expressions) {
-        const values = await evalExpressions(s.expressions, env);
+        const values = await evalExpressions(s.expressions, env, sf);
         for (let i = 0; i < s.names.length; i++) {
           env.setLocal(s.names[i].name, values[i]);
         }
@@ -462,25 +483,25 @@ export async function evalStatement(
     case "Block": {
       const newEnv = new LuaEnv(env);
       for (const statement of s.statements) {
-        await evalStatement(statement, newEnv);
+        await evalStatement(statement, newEnv, sf);
       }
       break;
     }
     case "If": {
       for (const cond of s.conditions) {
-        if (luaTruthy(await evalExpression(cond.condition, env))) {
-          return evalStatement(cond.block, env);
+        if (luaTruthy(await evalExpression(cond.condition, env, sf))) {
+          return evalStatement(cond.block, env, sf);
         }
       }
       if (s.elseBlock) {
-        return evalStatement(s.elseBlock, env);
+        return evalStatement(s.elseBlock, env, sf);
       }
       break;
     }
     case "While": {
-      while (luaTruthy(await evalExpression(s.condition, env))) {
+      while (luaTruthy(await evalExpression(s.condition, env, sf))) {
         try {
-          await evalStatement(s.block, env);
+          await evalStatement(s.block, env, sf);
         } catch (e: any) {
           if (e instanceof LuaBreak) {
             break;
@@ -494,7 +515,7 @@ export async function evalStatement(
     case "Repeat": {
       do {
         try {
-          await evalStatement(s.block, env);
+          await evalStatement(s.block, env, sf);
         } catch (e: any) {
           if (e instanceof LuaBreak) {
             break;
@@ -502,13 +523,13 @@ export async function evalStatement(
             throw e;
           }
         }
-      } while (!luaTruthy(await evalExpression(s.condition, env)));
+      } while (!luaTruthy(await evalExpression(s.condition, env, sf)));
       break;
     }
     case "Break":
       throw new LuaBreak();
     case "FunctionCallStatement": {
-      return evalExpression(s.call, env);
+      return evalExpression(s.call, env, sf);
     }
     case "Function": {
       let body = s.body;
@@ -527,7 +548,7 @@ export async function evalStatement(
         if (!settable) {
           throw new LuaRuntimeError(
             `Cannot find property ${propNames[i]}`,
-            s.name.ctx,
+            sf.withCtx(s.name.ctx),
           );
         }
       }
@@ -549,14 +570,14 @@ export async function evalStatement(
       // be optimized for the common case later
       throw new LuaReturn(
         await evalPromiseValues(
-          s.expressions.map((value) => evalExpression(value, env)),
+          s.expressions.map((value) => evalExpression(value, env, sf)),
         ),
       );
     }
     case "For": {
-      const start = await evalExpression(s.start, env);
-      const end = await evalExpression(s.end, env);
-      const step = s.step ? await evalExpression(s.step, env) : 1;
+      const start = await evalExpression(s.start, env, sf);
+      const end = await evalExpression(s.end, env, sf);
+      const step = s.step ? await evalExpression(s.step, env, sf) : 1;
       const localEnv = new LuaEnv(env);
       for (
         let i = start;
@@ -565,7 +586,7 @@ export async function evalStatement(
       ) {
         localEnv.setLocal(s.name, i);
         try {
-          await evalStatement(s.block, localEnv);
+          await evalStatement(s.block, localEnv, sf);
         } catch (e: any) {
           if (e instanceof LuaBreak) {
             break;
@@ -579,7 +600,7 @@ export async function evalStatement(
     case "ForIn": {
       const iteratorMultiRes = new LuaMultiRes(
         await evalPromiseValues(
-          s.expressions.map((e) => evalExpression(e, env)),
+          s.expressions.map((e) => evalExpression(e, env, sf)),
         ),
       ).flatten();
       const iteratorFunction: ILuaFunction | undefined =
@@ -588,7 +609,7 @@ export async function evalStatement(
         console.error("Cannot iterate over", iteratorMultiRes.values[0]);
         throw new LuaRuntimeError(
           `Cannot iterate over ${iteratorMultiRes.values[0]}`,
-          s.ctx,
+          sf.withCtx(s.ctx),
         );
       }
 
@@ -597,7 +618,7 @@ export async function evalStatement(
 
       while (true) {
         const iterResult = new LuaMultiRes(
-          await iteratorFunction.call(state, control),
+          await luaCall(iteratorFunction, [state, control], s.ctx, sf),
         ).flatten();
         if (
           iterResult.values[0] === null || iterResult.values[0] === undefined
@@ -609,7 +630,7 @@ export async function evalStatement(
           localEnv.setLocal(s.names[i], iterResult.values[i]);
         }
         try {
-          await evalStatement(s.block, localEnv);
+          await evalStatement(s.block, localEnv, sf);
         } catch (e: any) {
           if (e instanceof LuaBreak) {
             break;
@@ -626,6 +647,7 @@ export async function evalStatement(
 function evalLValue(
   lval: LuaLValue,
   env: LuaEnv,
+  sf: LuaStackFrame,
 ): LuaLValueContainer | Promise<LuaLValueContainer> {
   switch (lval.type) {
     case "Variable":
@@ -634,8 +656,9 @@ function evalLValue(
       const objValue = evalExpression(
         lval.object,
         env,
+        sf,
       );
-      const keyValue = evalExpression(lval.key, env);
+      const keyValue = evalExpression(lval.key, env, sf);
       if (
         objValue instanceof Promise ||
         keyValue instanceof Promise
@@ -658,6 +681,7 @@ function evalLValue(
       const objValue = evalExpression(
         lval.object,
         env,
+        sf,
       );
       if (objValue instanceof Promise) {
         return objValue.then((objValue) => {
diff --git a/common/space_lua/language.test.ts b/common/space_lua/language.test.ts
index 698287b5..372e2afc 100644
--- a/common/space_lua/language.test.ts
+++ b/common/space_lua/language.test.ts
@@ -1,9 +1,12 @@
 import { parse } from "$common/space_lua/parse.ts";
 import { luaBuildStandardEnv } from "$common/space_lua/stdlib.ts";
-import { LuaEnv, type LuaRuntimeError } from "$common/space_lua/runtime.ts";
+import {
+  LuaEnv,
+  type LuaRuntimeError,
+  LuaStackFrame,
+} from "$common/space_lua/runtime.ts";
 import { evalStatement } from "$common/space_lua/eval.ts";
 import { assert } from "@std/assert/assert";
-
 Deno.test("Lua language tests", async () => {
   // Read the Lua file
   const luaFile = await Deno.readTextFile(
@@ -11,9 +14,10 @@ Deno.test("Lua language tests", async () => {
   );
   const chunk = parse(luaFile, {});
   const env = new LuaEnv(luaBuildStandardEnv());
+  const sf = new LuaStackFrame(new LuaEnv(), chunk.ctx);
 
   try {
-    await evalStatement(chunk, env);
+    await evalStatement(chunk, env, sf);
   } catch (e: any) {
     console.error(`Error evaluating script:`, toPrettyString(e, luaFile));
     assert(false);
@@ -21,22 +25,32 @@ Deno.test("Lua language tests", async () => {
 });
 
 function toPrettyString(err: LuaRuntimeError, code: string): string {
-  if (!err.context || !err.context.from || !err.context.to) {
+  if (!err.sf || !err.sf.astCtx?.from || !err.sf.astCtx?.to) {
     return err.toString();
   }
-  const from = err.context.from;
-  // Find the line and column
-  let line = 1;
-  let column = 0;
-  for (let i = 0; i < from; i++) {
-    if (code[i] === "\n") {
-      line++;
-      column = 0;
-    } else {
-      column++;
+  let traceStr = "";
+  let current: LuaStackFrame | undefined = err.sf;
+  while (current) {
+    const ctx = current.astCtx;
+    if (!ctx || !ctx.from || !ctx.to) {
+      break;
+    }
+    // Find the line and column
+    let line = 1;
+    let column = 0;
+    for (let i = 0; i < ctx.from; i++) {
+      if (code[i] === "\n") {
+        line++;
+        column = 0;
+      } else {
+        column++;
+      }
     }
+    traceStr += `* ${ctx.ref || "(unknown source)"} @ ${line}:${column}:\n   ${
+      code.substring(ctx.from, ctx.to)
+    }\n`;
+    current = current.parent;
   }
-  return `LuaRuntimeError: ${err.message} at ${line}:${column}:\n   ${
-    code.substring(from, err.context.to)
-  }`;
+
+  return `LuaRuntimeError: ${err.message} ${traceStr}`;
 }
diff --git a/common/space_lua/language_test.lua b/common/space_lua/language_test.lua
index eae2ac13..0da9956c 100644
--- a/common/space_lua/language_test.lua
+++ b/common/space_lua/language_test.lua
@@ -125,7 +125,7 @@ mt = {
 t = setmetatable({}, mt)
 t.bar = "bar"
 assert(t.bar == "bar")
-assert(t.foo == "Key not found: foo")
+assert_equal(t.foo, "Key not found: foo")
 
 -- Test the __newindex metamethod
 t = setmetatable(
diff --git a/common/space_lua/runtime.test.ts b/common/space_lua/runtime.test.ts
index fdefe30f..1d38cc50 100644
--- a/common/space_lua/runtime.test.ts
+++ b/common/space_lua/runtime.test.ts
@@ -3,6 +3,7 @@ import {
   jsToLuaValue,
   luaLen,
   LuaMultiRes,
+  LuaStackFrame,
 } from "$common/space_lua/runtime.ts";
 
 Deno.test("Test Lua Rutime", () => {
@@ -40,5 +41,5 @@ Deno.test("Test Lua Rutime", () => {
   assertEquals(luaVal.get(2).get("name"), "John");
   // Functions in objects
   luaVal = jsToLuaValue({ name: "Pete", first: (l: any[]) => l[0] });
-  assertEquals(luaVal.get("first").call([1, 2, 3]), 1);
+  assertEquals(luaVal.get("first").call(LuaStackFrame.lostFrame, [1, 2, 3]), 1);
 });
diff --git a/common/space_lua/runtime.ts b/common/space_lua/runtime.ts
index 4251074b..f2677102 100644
--- a/common/space_lua/runtime.ts
+++ b/common/space_lua/runtime.ts
@@ -17,16 +17,16 @@ export type LuaValue = any;
 export type JSValue = any;
 
 export interface ILuaFunction {
-  call(...args: LuaValue[]): Promise<LuaValue> | LuaValue;
+  call(sf: LuaStackFrame, ...args: LuaValue[]): Promise<LuaValue> | LuaValue;
   toString(): string;
 }
 
 export interface ILuaSettable {
-  set(key: LuaValue, value: LuaValue): void;
+  set(key: LuaValue, value: LuaValue, sf?: LuaStackFrame): void;
 }
 
 export interface ILuaGettable {
-  get(key: LuaValue): LuaValue | undefined;
+  get(key: LuaValue, sf?: LuaStackFrame): LuaValue | undefined;
 }
 
 export class LuaEnv implements ILuaSettable, ILuaGettable {
@@ -39,20 +39,30 @@ export class LuaEnv implements ILuaSettable, ILuaGettable {
     this.variables.set(name, value);
   }
 
-  set(key: string, value: LuaValue): void {
+  set(key: string, value: LuaValue, sf?: LuaStackFrame): void {
     if (this.variables.has(key) || !this.parent) {
       this.variables.set(key, value);
     } else {
-      this.parent.set(key, value);
+      this.parent.set(key, value, sf);
     }
   }
 
-  get(name: string): LuaValue | undefined {
+  has(key: string): boolean {
+    if (this.variables.has(key)) {
+      return true;
+    }
+    if (this.parent) {
+      return this.parent.has(key);
+    }
+    return false;
+  }
+
+  get(name: string, sf?: LuaStackFrame): LuaValue | undefined {
     if (this.variables.has(name)) {
       return this.variables.get(name);
     }
     if (this.parent) {
-      return this.parent.get(name);
+      return this.parent.get(name, sf);
     }
     return undefined;
   }
@@ -69,6 +79,21 @@ export class LuaEnv implements ILuaSettable, ILuaGettable {
   }
 }
 
+export class LuaStackFrame {
+  constructor(
+    readonly threadLocal: LuaEnv,
+    readonly astCtx: ASTCtx | null,
+    readonly parent?: LuaStackFrame,
+  ) {
+  }
+
+  withCtx(ctx: ASTCtx): LuaStackFrame {
+    return new LuaStackFrame(this.threadLocal, ctx, this);
+  }
+
+  static lostFrame = new LuaStackFrame(new LuaEnv(), null);
+}
+
 export class LuaMultiRes {
   values: any[];
 
@@ -110,12 +135,16 @@ export function singleResult(value: any): any {
 }
 
 export class LuaFunction implements ILuaFunction {
-  constructor(private body: LuaFunctionBody, private closure: LuaEnv) {
+  constructor(readonly body: LuaFunctionBody, private closure: LuaEnv) {
   }
 
-  call(...args: LuaValue[]): Promise<LuaValue> | LuaValue {
+  call(sf: LuaStackFrame, ...args: LuaValue[]): Promise<LuaValue> | LuaValue {
     // Create a new environment for this function call
     const env = new LuaEnv(this.closure);
+    if (!sf) {
+      console.trace(sf);
+    }
+    env.setLocal("_CTX", sf.threadLocal);
     // Assign the passed arguments to the parameters
     for (let i = 0; i < this.body.parameters.length; i++) {
       let arg = args[i];
@@ -124,7 +153,7 @@ export class LuaFunction implements ILuaFunction {
       }
       env.setLocal(this.body.parameters[i], arg);
     }
-    return evalStatement(this.body.block, env).catch((e: any) => {
+    return evalStatement(this.body.block, env, sf).catch((e: any) => {
       if (e instanceof LuaReturn) {
         if (e.values.length === 0) {
           return;
@@ -149,7 +178,7 @@ export class LuaNativeJSFunction implements ILuaFunction {
   }
 
   // Performs automatic conversion between Lua and JS values
-  call(...args: LuaValue[]): Promise<LuaValue> | LuaValue {
+  call(_sf: LuaStackFrame, ...args: LuaValue[]): Promise<LuaValue> | LuaValue {
     const result = this.fn(...args.map(luaValueToJS));
     if (result instanceof Promise) {
       return result.then(jsToLuaValue);
@@ -164,11 +193,13 @@ export class LuaNativeJSFunction implements ILuaFunction {
 }
 
 export class LuaBuiltinFunction implements ILuaFunction {
-  constructor(readonly fn: (...args: LuaValue[]) => LuaValue) {
+  constructor(
+    readonly fn: (sf: LuaStackFrame, ...args: LuaValue[]) => LuaValue,
+  ) {
   }
 
-  call(...args: LuaValue[]): Promise<LuaValue> | LuaValue {
-    return this.fn(...args);
+  call(sf: LuaStackFrame, ...args: LuaValue[]): Promise<LuaValue> | LuaValue {
+    return this.fn(sf, ...args);
   }
 
   toString(): string {
@@ -236,14 +267,13 @@ export class LuaTable implements ILuaSettable, ILuaGettable {
     }
   }
 
-  set(key: LuaValue, value: LuaValue): void {
+  set(key: LuaValue, value: LuaValue, sf?: LuaStackFrame): void {
     // New index handling for metatables
     if (this.metatable && this.metatable.has("__newindex") && !this.has(key)) {
-      const metaValue = this.metatable.get("__newindex");
-      if (metaValue.call) {
-        metaValue.call(this, key, value);
-        return;
-      }
+      const metaValue = this.metatable.get("__newindex", sf);
+      // TODO: This may return a promise, we should handle that
+      luaCall(metaValue, [this, key, value], metaValue.ctx, sf);
+      return;
     }
 
     this.rawSet(key, value);
@@ -259,16 +289,16 @@ export class LuaTable implements ILuaSettable, ILuaGettable {
     }
   }
 
-  get(key: LuaValue): LuaValue | null {
+  get(key: LuaValue, sf?: LuaStackFrame): LuaValue | null {
     const value = this.rawGet(key);
     if (value === undefined || value === null) {
       // Invoke the meta table
       if (this.metatable) {
-        const metaValue = this.metatable.get("__index");
+        const metaValue = this.metatable.get("__index", sf);
         if (metaValue.call) {
-          return metaValue.call(this, key);
+          return metaValue.call(sf, this, key);
         } else if (metaValue instanceof LuaTable) {
-          return metaValue.get(key);
+          return metaValue.get(key, sf);
         } else {
           throw new Error("Meta table __index must be a function or table");
         }
@@ -285,10 +315,10 @@ export class LuaTable implements ILuaSettable, ILuaGettable {
     this.arrayPart.splice(pos - 1, 1);
   }
 
-  async sort(fn?: ILuaFunction) {
-    if (fn) {
+  async sort(fn?: ILuaFunction, sf?: LuaStackFrame) {
+    if (fn && sf) {
       this.arrayPart = await asyncQuickSort(this.arrayPart, async (a, b) => {
-        return (await fn.call(a, b)) ? -1 : 1;
+        return (await fn.call(sf, a, b)) ? -1 : 1;
       });
     } else {
       this.arrayPart.sort();
@@ -311,7 +341,7 @@ export class LuaTable implements ILuaSettable, ILuaGettable {
     if (this.metatable?.has("__tostring")) {
       const metaValue = this.metatable.get("__tostring");
       if (metaValue.call) {
-        return metaValue.call(this);
+        return metaValue.call(LuaStackFrame.lostFrame, this);
       } else {
         throw new Error("Meta table __tostring must be a function");
       }
@@ -342,37 +372,37 @@ export class LuaTable implements ILuaSettable, ILuaGettable {
 
 export type LuaLValueContainer = { env: ILuaSettable; key: LuaValue };
 
-export function luaSet(obj: any, key: any, value: any, ctx: ASTCtx) {
+export function luaSet(obj: any, key: any, value: any, sf: LuaStackFrame) {
   if (!obj) {
     throw new LuaRuntimeError(
       `Not a settable object: nil`,
-      ctx,
+      sf,
     );
   }
 
   if (obj instanceof LuaTable || obj instanceof LuaEnv) {
-    obj.set(key, value);
+    obj.set(key, value, sf);
   } else {
     obj[key] = value;
   }
 }
 
-export function luaGet(obj: any, key: any, ctx: ASTCtx): any {
+export function luaGet(obj: any, key: any, sf: LuaStackFrame): any {
   if (!obj) {
     throw new LuaRuntimeError(
       `Attempting to index a nil value`,
-      ctx,
+      sf,
     );
   }
   if (key === null || key === undefined) {
     throw new LuaRuntimeError(
       `Attempting to index with a nil key`,
-      ctx,
+      sf,
     );
   }
 
   if (obj instanceof LuaTable || obj instanceof LuaEnv) {
-    return obj.get(key);
+    return obj.get(key, sf);
   } else if (typeof key === "number") {
     return obj[key - 1];
   } else {
@@ -397,11 +427,16 @@ export function luaLen(obj: any): number {
   }
 }
 
-export function luaCall(fn: any, args: any[], ctx: ASTCtx): any {
+export function luaCall(
+  fn: any,
+  args: any[],
+  ctx: ASTCtx,
+  sf?: LuaStackFrame,
+): any {
   if (!fn) {
     throw new LuaRuntimeError(
       `Attempting to call a nil value`,
-      ctx,
+      (sf || LuaStackFrame.lostFrame).withCtx(ctx),
     );
   }
   if (typeof fn === "function") {
@@ -409,7 +444,13 @@ export function luaCall(fn: any, args: any[], ctx: ASTCtx): any {
     // Native JS function
     return fn(...jsArgs);
   }
-  return fn.call(...args);
+  if (!fn.call) {
+    throw new LuaRuntimeError(
+      `Attempting to call a non-callable value`,
+      (sf || LuaStackFrame.lostFrame).withCtx(ctx),
+    );
+  }
+  return fn.call((sf || LuaStackFrame.lostFrame).withCtx(ctx), ...args);
 }
 
 export function luaTypeOf(val: any): LuaType {
@@ -445,14 +486,14 @@ export class LuaReturn extends Error {
 export class LuaRuntimeError extends Error {
   constructor(
     override readonly message: string,
-    public context: ASTCtx,
+    public sf: LuaStackFrame,
     cause?: Error,
   ) {
     super(message, cause);
   }
 
   override toString() {
-    return `LuaRuntimeError: ${this.message} at ${this.context.from}, ${this.context.to}`;
+    return `LuaRuntimeError: ${this.message} at ${this.sf.astCtx?.from}, ${this.sf.astCtx?.to}`;
   }
 }
 
diff --git a/common/space_lua/stdlib.ts b/common/space_lua/stdlib.ts
index e44a5d14..f039ee9e 100644
--- a/common/space_lua/stdlib.ts
+++ b/common/space_lua/stdlib.ts
@@ -1,8 +1,10 @@
 import {
   type ILuaFunction,
   LuaBuiltinFunction,
+  luaCall,
   LuaEnv,
   LuaMultiRes,
+  LuaRuntimeError,
   type LuaTable,
   luaToString,
   luaTypeOf,
@@ -13,19 +15,19 @@ import { tableApi } from "$common/space_lua/stdlib/table.ts";
 import { osApi } from "$common/space_lua/stdlib/os.ts";
 import { jsApi } from "$common/space_lua/stdlib/js.ts";
 
-const printFunction = new LuaBuiltinFunction((...args) => {
+const printFunction = new LuaBuiltinFunction((_sf, ...args) => {
   console.log("[Lua]", ...args.map(luaToString));
 });
 
 const assertFunction = new LuaBuiltinFunction(
-  async (value: any, message?: string) => {
+  async (sf, value: any, message?: string) => {
     if (!await value) {
-      throw new Error(`Assertion failed: ${message}`);
+      throw new LuaRuntimeError(`Assertion failed: ${message}`, sf);
     }
   },
 );
 
-const ipairsFunction = new LuaBuiltinFunction((ar: LuaTable) => {
+const ipairsFunction = new LuaBuiltinFunction((_sf, ar: LuaTable) => {
   let i = 1;
   return () => {
     if (i > ar.length) {
@@ -37,7 +39,7 @@ const ipairsFunction = new LuaBuiltinFunction((ar: LuaTable) => {
   };
 });
 
-const pairsFunction = new LuaBuiltinFunction((t: LuaTable) => {
+const pairsFunction = new LuaBuiltinFunction((_sf, t: LuaTable) => {
   const keys = t.keys();
   let i = 0;
   return () => {
@@ -50,7 +52,7 @@ const pairsFunction = new LuaBuiltinFunction((t: LuaTable) => {
   };
 });
 
-const unpackFunction = new LuaBuiltinFunction((t: LuaTable) => {
+const unpackFunction = new LuaBuiltinFunction((_sf, t: LuaTable) => {
   const values: LuaValue[] = [];
   for (let i = 1; i <= t.length; i++) {
     values.push(t.get(i));
@@ -58,26 +60,26 @@ const unpackFunction = new LuaBuiltinFunction((t: LuaTable) => {
   return new LuaMultiRes(values);
 });
 
-const typeFunction = new LuaBuiltinFunction((value: LuaValue): string => {
+const typeFunction = new LuaBuiltinFunction((_sf, value: LuaValue): string => {
   return luaTypeOf(value);
 });
 
-const tostringFunction = new LuaBuiltinFunction((value: any) => {
+const tostringFunction = new LuaBuiltinFunction((_sf, value: any) => {
   return luaToString(value);
 });
 
-const tonumberFunction = new LuaBuiltinFunction((value: LuaValue) => {
+const tonumberFunction = new LuaBuiltinFunction((_sf, value: LuaValue) => {
   return Number(value);
 });
 
-const errorFunction = new LuaBuiltinFunction((message: string) => {
+const errorFunction = new LuaBuiltinFunction((_sf, message: string) => {
   throw new Error(message);
 });
 
 const pcallFunction = new LuaBuiltinFunction(
-  async (fn: ILuaFunction, ...args) => {
+  async (sf, fn: ILuaFunction, ...args) => {
     try {
-      return new LuaMultiRes([true, await fn.call(...args)]);
+      return new LuaMultiRes([true, await luaCall(fn, args, sf.astCtx!, sf)]);
     } catch (e: any) {
       return new LuaMultiRes([false, e.message]);
     }
@@ -85,30 +87,33 @@ const pcallFunction = new LuaBuiltinFunction(
 );
 
 const xpcallFunction = new LuaBuiltinFunction(
-  async (fn: ILuaFunction, errorHandler: ILuaFunction, ...args) => {
+  async (sf, fn: ILuaFunction, errorHandler: ILuaFunction, ...args) => {
     try {
-      return new LuaMultiRes([true, await fn.call(...args)]);
+      return new LuaMultiRes([true, await fn.call(sf, ...args)]);
     } catch (e: any) {
-      return new LuaMultiRes([false, await errorHandler.call(e.message)]);
+      return new LuaMultiRes([
+        false,
+        await luaCall(errorHandler, [e.message], sf.astCtx!, sf),
+      ]);
     }
   },
 );
 
 const setmetatableFunction = new LuaBuiltinFunction(
-  (table: LuaTable, metatable: LuaTable) => {
+  (_sf, table: LuaTable, metatable: LuaTable) => {
     table.metatable = metatable;
     return table;
   },
 );
 
 const rawsetFunction = new LuaBuiltinFunction(
-  (table: LuaTable, key: LuaValue, value: LuaValue) => {
+  (_sf, table: LuaTable, key: LuaValue, value: LuaValue) => {
     table.rawSet(key, value);
     return table;
   },
 );
 
-const getmetatableFunction = new LuaBuiltinFunction((table: LuaTable) => {
+const getmetatableFunction = new LuaBuiltinFunction((_sf, table: LuaTable) => {
   return table.metatable;
 });
 
diff --git a/common/space_lua/stdlib/js.ts b/common/space_lua/stdlib/js.ts
index b26d2109..7093b77f 100644
--- a/common/space_lua/stdlib/js.ts
+++ b/common/space_lua/stdlib/js.ts
@@ -13,13 +13,13 @@ export const jsApi = new LuaTable({
       );
     },
   ),
-  importModule: new LuaBuiltinFunction((url) => {
+  importModule: new LuaBuiltinFunction((_sf, url) => {
     return import(url);
   }),
 
-  tolua: new LuaBuiltinFunction(jsToLuaValue),
-  tojs: new LuaBuiltinFunction(luaValueToJS),
-  log: new LuaBuiltinFunction((...args) => {
+  tolua: new LuaBuiltinFunction((_sf, val) => jsToLuaValue(val)),
+  tojs: new LuaBuiltinFunction((_sf, val) => luaValueToJS(val)),
+  log: new LuaBuiltinFunction((_sf, ...args) => {
     console.log(...args);
   }),
   // assignGlobal: new LuaBuiltinFunction((name: string, value: any) => {
diff --git a/common/space_lua/stdlib/os.ts b/common/space_lua/stdlib/os.ts
index 39ede481..947e975f 100644
--- a/common/space_lua/stdlib/os.ts
+++ b/common/space_lua/stdlib/os.ts
@@ -1,7 +1,7 @@
 import { LuaBuiltinFunction, LuaTable } from "$common/space_lua/runtime.ts";
 
 export const osApi = new LuaTable({
-  time: new LuaBuiltinFunction((tbl?: LuaTable) => {
+  time: new LuaBuiltinFunction((_sf, tbl?: LuaTable) => {
     if (tbl) {
       // Build a date object from the table
       const date = new Date();
@@ -32,7 +32,7 @@ export const osApi = new LuaTable({
    * If format is not "*t", then date returns the date as a string, formatted according to the same rules as the ISO C function strftime.
    * If format is absent, it defaults to "%c", which gives a human-readable date and time representation using the current locale.
    */
-  date: new LuaBuiltinFunction((format: string, timestamp?: number) => {
+  date: new LuaBuiltinFunction((_sf, format: string, timestamp?: number) => {
     const date = timestamp ? new Date(timestamp * 1000) : new Date();
 
     // Default Lua-like format when no format string is provided
diff --git a/common/space_lua/stdlib/string.ts b/common/space_lua/stdlib/string.ts
index ae3d1031..d8aa4c32 100644
--- a/common/space_lua/stdlib/string.ts
+++ b/common/space_lua/stdlib/string.ts
@@ -6,7 +6,7 @@ import {
 } from "$common/space_lua/runtime.ts";
 
 export const stringApi = new LuaTable({
-  byte: new LuaBuiltinFunction((s: string, i?: number, j?: number) => {
+  byte: new LuaBuiltinFunction((_sf, s: string, i?: number, j?: number) => {
     i = i ?? 1;
     j = j ?? i;
     const result = [];
@@ -15,11 +15,11 @@ export const stringApi = new LuaTable({
     }
     return new LuaMultiRes(result);
   }),
-  char: new LuaBuiltinFunction((...args: number[]) => {
+  char: new LuaBuiltinFunction((_sf, ...args: number[]) => {
     return String.fromCharCode(...args);
   }),
   find: new LuaBuiltinFunction(
-    (s: string, pattern: string, init?: number, plain?: boolean) => {
+    (_sf, s: string, pattern: string, init?: number, plain?: boolean) => {
       init = init ?? 1;
       plain = plain ?? false;
       const result = s.slice(init - 1).match(pattern);
@@ -32,7 +32,7 @@ export const stringApi = new LuaTable({
       ]);
     },
   ),
-  format: new LuaBuiltinFunction((format: string, ...args: any[]) => {
+  format: new LuaBuiltinFunction((_sf, format: string, ...args: any[]) => {
     return format.replace(/%./g, (match) => {
       switch (match) {
         case "%s":
@@ -44,7 +44,7 @@ export const stringApi = new LuaTable({
       }
     });
   }),
-  gmatch: new LuaBuiltinFunction((s: string, pattern: string) => {
+  gmatch: new LuaBuiltinFunction((_sf, s: string, pattern: string) => {
     const regex = new RegExp(pattern, "g");
     return () => {
       const result = regex.exec(s);
@@ -55,7 +55,7 @@ export const stringApi = new LuaTable({
     };
   }),
   gsub: new LuaBuiltinFunction(
-    (s: string, pattern: string, repl: string, n?: number) => {
+    (_sf, s: string, pattern: string, repl: string, n?: number) => {
       n = n ?? Infinity;
       const regex = new RegExp(pattern, "g");
       let result = s;
@@ -70,17 +70,17 @@ export const stringApi = new LuaTable({
       return result;
     },
   ),
-  len: new LuaBuiltinFunction((s: string) => {
+  len: new LuaBuiltinFunction((_sf, s: string) => {
     return s.length;
   }),
-  lower: new LuaBuiltinFunction((s: string) => {
+  lower: new LuaBuiltinFunction((_sf, s: string) => {
     return luaToString(s.toLowerCase());
   }),
-  upper: new LuaBuiltinFunction((s: string) => {
+  upper: new LuaBuiltinFunction((_sf, s: string) => {
     return luaToString(s.toUpperCase());
   }),
   match: new LuaBuiltinFunction(
-    (s: string, pattern: string, init?: number) => {
+    (_sf, s: string, pattern: string, init?: number) => {
       init = init ?? 1;
       const result = s.slice(init - 1).match(pattern);
       if (!result) {
@@ -89,18 +89,18 @@ export const stringApi = new LuaTable({
       return new LuaMultiRes(result.slice(1));
     },
   ),
-  rep: new LuaBuiltinFunction((s: string, n: number, sep?: string) => {
+  rep: new LuaBuiltinFunction((_sf, s: string, n: number, sep?: string) => {
     sep = sep ?? "";
     return s.repeat(n) + sep;
   }),
-  reverse: new LuaBuiltinFunction((s: string) => {
+  reverse: new LuaBuiltinFunction((_sf, s: string) => {
     return s.split("").reverse().join("");
   }),
-  sub: new LuaBuiltinFunction((s: string, i: number, j?: number) => {
+  sub: new LuaBuiltinFunction((_sf, s: string, i: number, j?: number) => {
     j = j ?? s.length;
     return s.slice(i - 1, j);
   }),
-  split: new LuaBuiltinFunction((s: string, sep: string) => {
+  split: new LuaBuiltinFunction((_sf, s: string, sep: string) => {
     return s.split(sep);
   }),
 });
diff --git a/common/space_lua/stdlib/table.ts b/common/space_lua/stdlib/table.ts
index b6644c03..72c03c49 100644
--- a/common/space_lua/stdlib/table.ts
+++ b/common/space_lua/stdlib/table.ts
@@ -6,7 +6,7 @@ import {
 
 export const tableApi = new LuaTable({
   concat: new LuaBuiltinFunction(
-    (tbl: LuaTable, sep?: string, i?: number, j?: number) => {
+    (_sf, tbl: LuaTable, sep?: string, i?: number, j?: number) => {
       sep = sep ?? "";
       i = i ?? 1;
       j = j ?? tbl.length;
@@ -18,7 +18,7 @@ export const tableApi = new LuaTable({
     },
   ),
   insert: new LuaBuiltinFunction(
-    (tbl: LuaTable, posOrValue: number | any, value?: any) => {
+    (_sf, tbl: LuaTable, posOrValue: number | any, value?: any) => {
       if (value === undefined) {
         value = posOrValue;
         posOrValue = tbl.length + 1;
@@ -26,11 +26,11 @@ export const tableApi = new LuaTable({
       tbl.insert(posOrValue, value);
     },
   ),
-  remove: new LuaBuiltinFunction((tbl: LuaTable, pos?: number) => {
+  remove: new LuaBuiltinFunction((_sf, tbl: LuaTable, pos?: number) => {
     pos = pos ?? tbl.length;
     tbl.remove(pos);
   }),
-  sort: new LuaBuiltinFunction((tbl: LuaTable, comp?: ILuaFunction) => {
-    return tbl.sort(comp);
+  sort: new LuaBuiltinFunction((sf, tbl: LuaTable, comp?: ILuaFunction) => {
+    return tbl.sort(comp, sf);
   }),
 });
diff --git a/common/space_lua_api.ts b/common/space_lua_api.ts
index 8b1be345..2444a774 100644
--- a/common/space_lua_api.ts
+++ b/common/space_lua_api.ts
@@ -5,6 +5,7 @@ import {
   LuaBuiltinFunction,
   LuaEnv,
   LuaNativeJSFunction,
+  LuaStackFrame,
   LuaTable,
 } from "$common/space_lua/runtime.ts";
 import type { System } from "$lib/plugos/system.ts";
@@ -24,17 +25,18 @@ export function buildLuaEnv(system: System<any>, scriptEnv: ScriptEnvironment) {
 
 function exposeSyscalls(env: LuaEnv, system: System<any>) {
   // Expose all syscalls to Lua
+  const nativeFs = new LuaStackFrame(env, null);
   for (const syscallName of system.registeredSyscalls.keys()) {
     const [ns, fn] = syscallName.split(".");
-    if (!env.get(ns)) {
-      env.set(ns, new LuaTable());
+    if (!env.has(ns)) {
+      env.set(ns, new LuaTable(), nativeFs);
     }
     const luaFn = new LuaNativeJSFunction((...args) => {
       return system.localSyscall(syscallName, args);
     });
     // Register the function with the same name as the syscall both in regular and snake_case
-    env.get(ns).set(fn, luaFn);
-    env.get(ns).set(snakeCase(fn), luaFn);
+    env.get(ns, nativeFs).set(fn, luaFn, nativeFs);
+    env.get(ns, nativeFs).set(snakeCase(fn), luaFn, nativeFs);
   }
 }
 
@@ -47,7 +49,7 @@ function exposeDefinitions(
   env.set(
     "define_command",
     new LuaBuiltinFunction(
-      (def: LuaTable) => {
+      (_sf, def: LuaTable) => {
         if (def.get(1) === undefined) {
           throw new Error("Callback is required");
         }
@@ -65,10 +67,9 @@ function exposeDefinitions(
             hide: def.get("hide"),
           } as CommandDef,
           async (...args: any[]) => {
+            const sf = new LuaStackFrame(new LuaEnv(), null);
             try {
-              return await def.get(1).call(
-                ...args.map(jsToLuaValue),
-              );
+              return await def.get(1).call(sf, ...args.map(jsToLuaValue));
             } catch (e: any) {
               await handleLuaError(e, system);
             }
@@ -79,7 +80,7 @@ function exposeDefinitions(
   );
   env.set(
     "define_event_listener",
-    new LuaBuiltinFunction((def: LuaTable) => {
+    new LuaBuiltinFunction((_sf, def: LuaTable) => {
       if (def.get(1) === undefined) {
         throw new Error("Callback is required");
       }
@@ -90,10 +91,9 @@ function exposeDefinitions(
       scriptEnv.registerEventListener(
         { name: def.get("event") },
         async (...args: any[]) => {
+          const sf = new LuaStackFrame(new LuaEnv(), null);
           try {
-            return await def.get(1).call(
-              ...args.map(jsToLuaValue),
-            );
+            return await def.get(1).call(sf, ...args.map(jsToLuaValue));
           } catch (e: any) {
             await handleLuaError(e, system);
           }
diff --git a/web/cm_plugins/lua_directive.ts b/web/cm_plugins/lua_directive.ts
index e41b499c..827f9654 100644
--- a/web/cm_plugins/lua_directive.ts
+++ b/web/cm_plugins/lua_directive.ts
@@ -14,7 +14,11 @@ import type {
   LuaFunctionCallStatement,
 } from "$common/space_lua/ast.ts";
 import { evalExpression } from "$common/space_lua/eval.ts";
-import { luaValueToJS } from "$common/space_lua/runtime.ts";
+import {
+  LuaEnv,
+  LuaStackFrame,
+  luaValueToJS,
+} from "$common/space_lua/runtime.ts";
 import { LuaRuntimeError } from "$common/space_lua/runtime.ts";
 import { encodePageRef } from "@silverbulletmd/silverbullet/lib/page_ref";
 import { resolveASTReference } from "$common/space_lua.ts";
@@ -54,16 +58,18 @@ export function luaDirectivePlugin(client: Client) {
                     (parsedLua.statements[0] as LuaFunctionCallStatement).call
                       .args[0];
 
+                  const sf = new LuaStackFrame(new LuaEnv(), expr.ctx);
                   return luaValueToJS(
                     await evalExpression(
                       expr,
                       client.clientSystem.spaceLuaEnv.env,
+                      sf,
                     ),
                   );
                 } catch (e: any) {
                   if (e instanceof LuaRuntimeError) {
-                    if (e.context.ref) {
-                      const source = resolveASTReference(e.context);
+                    if (e.sf.astCtx) {
+                      const source = resolveASTReference(e.sf.astCtx);
                       if (source) {
                         // We know the origin node of the error, let's reference it
                         return {