diff --git a/.github/workflows/latest.yml b/.github/workflows/latest.yml
index 047f0b8..2849812 100644
--- a/.github/workflows/latest.yml
+++ b/.github/workflows/latest.yml
@@ -16,7 +16,10 @@ jobs:
         with:
           toolchain: stable
           #        targets: x86_64-unknown-linux-musl
+      - run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
       - run: cargo test --verbose -- --nocapture
+      - run: wasm-pack test --headless --firefox ./adana-script-wasm
+      - run: wasm-pack test --headless --chrome ./adana-script-wasm
   docker:
     needs: test
     runs-on: ubuntu-latest
diff --git a/.github/workflows/release-wasm.yml b/.github/workflows/release-wasm.yml
index eba86e0..e168752 100644
--- a/.github/workflows/release-wasm.yml
+++ b/.github/workflows/release-wasm.yml
@@ -1,9 +1,15 @@
 name: Release WASM
 
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
 on:
   push:
     tags:
       - "**[0-9]+.[0-9]+.[0-9]+*"
+  workflow_dispatch:
 
 env:
   CARGO_TERM_COLOR: always
@@ -23,11 +29,24 @@ jobs:
           curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
           wasm-pack build --target web --release --scope nbittich ./adana-script-wasm
           wasm-pack pack ./adana-script-wasm/pkg
+          mkdir ghPages
+          cp -r  ./adana-script-wasm/pkg ghPages
+          cp ./adana-playground/app.js ghPages
+          cp ./adana-playground/style.css ghPages
+          cp ./adana-playground/favicon.ico ghPages
+          cp ./adana-playground/examples.js ghPages
+          cp ./adana-playground/index.html ghPages
+
       - name: Upload pkg
         uses: actions/upload-artifact@v4
         with:
           name: pkg
           path: adana-script-wasm/pkg
+      - name: Upload ghPages
+        uses: actions/upload-artifact@v4
+        with:
+          name: ghPages
+          path: ghPages
   publish:
     needs: build
     runs-on: ubuntu-latest
@@ -49,3 +68,19 @@ jobs:
           cd pkg
           npm install
           npm publish --access public
+  gh-pages:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download ghPages
+        uses: actions/download-artifact@v4
+        with:
+          name: ghPages
+          path: "_site/"
+      - name: Upload pages
+        uses: actions/upload-pages-artifact@v3
+      - name: Deploy pages
+        uses: actions/deploy-pages@v4
diff --git a/.gitignore b/.gitignore
index f00b4de..3a6cac8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /target
 .idea
-.history
\ No newline at end of file
+.history
+Cargo.lock
diff --git a/Cargo.lock b/Cargo.lock
deleted file mode 100644
index 8b6af5d..0000000
--- a/Cargo.lock
+++ /dev/null
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diff --git a/Cargo.toml b/Cargo.toml
index 2cb51db..648b138 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ description = "namespaces aliases for command lines & basic scripting language"
 homepage = "https://github.com/nbittich/adana"
 repository = "https://github.com/nbittich/adana"
 readme = "README.md"
-rust-version = "1.75"
+rust-version = "1.76"
 edition = "2021"
 license = "MIT"
 exclude = ["vscode/", "dist/", ".vscode", ".history", ".git", ".github"]
@@ -48,6 +48,8 @@ console_error_panic_hook = { version = "0.1.7" }
 serde-wasm-bindgen = "0.6.3"
 wee_alloc = "0.4.5"
 wasm-bindgen-test = "0.3.41"
+web-sys = "0.3.68"
+
 # workspace specific libs
 adana-script-core = { version = "0.17.2", path = "./adana-script-core" }
 adana-script = { version = "0.17.2", path = "./adana-script" }
diff --git a/Dockerfile b/Dockerfile
index ea7f23a..fe6eae1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM rust:1.75-bookworm as builder
+FROM rust:1.76-bookworm as builder
 
 WORKDIR /app
 
@@ -10,7 +10,7 @@ COPY . .
 
 RUN cargo build --release 
 
-FROM rust:1.75-slim-bookworm
+FROM rust:1.76-slim-bookworm
 
 ENV RUST_LOG=info
 
diff --git a/README.md b/README.md
index 1826341..b35053e 100644
--- a/README.md
+++ b/README.md
@@ -530,6 +530,7 @@ Below, is a list of types and how you declare them. You can also define your str
 | array    | `[1,2,"3", true]`                                                                                |
 | function | `() => {"hello"}` <br> `(name) => {"hello" + name}` <br> `(n) => {`<br>&emsp; `"hello"`<br>`  }` |
 | struct   | `struct {x: 8, y: ()=> {println("hello!")}}`                                                     |
+| error    | `make_err("could not process...")`                                                               |
 
 <hr>
 
@@ -744,29 +745,39 @@ You already have seen `length` to find the length of an array or string, `includ
 
 Here is a list of built-in functions available:
 
-| name      | description                  | example                            |
-| --------- | ---------------------------- | ---------------------------------- |
-| sqrt      | square root                  | `sqrt(2)`                          |
-| abs       | absolute value               | `abs(-2)`                          |
-| log       | logarithm                    | `log(2)`                           |
-| ln        | natural logarithm            | `ln(2)`                            |
-| length    | length of an array or string | `length("azert")`                  |
-| sin       | sine of a number             | `sin(2)`                           |
-| cos       | cosine of a number           | `cos(2)`                           |
-| tan       | tangent of a number          | `tan(2.2)`                         |
-| print     | print without a newline      | `print("hello")`                   |
-| println   | print with a newline         | `println("hello")`                 |
-| include   | include a script             | `include("scripts/test_fn.adana")` |
-| require   | load a shared object         | `require("my_lib.so")`             |
-| to_int    | cast to int                  | `to_int("2")`<br>`to_int(2.2)`     |
-| to_hex    | format num to hex            | `to_hex(2)`<br>`to_hex(2.2)`       |
-| to_binary | format num to binary         | `to_binary(2)`                     |
-| to_double | cast to double               | `to_double("2.2")`                 |
-| to_bool   | cast to bool                 | `to_bool("true")`                  |
-| to_string | cast to string               | `to_string(true)`                  |
-| drop      | drop a variable from context | `drop("myvar")`<br>`drop(arr[0])`  |
-| eval      | Evaluate a string as code    | `eval("sqrt(9)")`                  |
-| type_of   | Type of variable             | `type_of(true)`                    |
+| name        | description                  | example                            |
+| ----------- | ---------------------------- | ---------------------------------- |
+| sqrt        | square root                  | `sqrt(2)`                          |
+| abs         | absolute value               | `abs(-2)`                          |
+| log         | logarithm                    | `log(2)`                           |
+| ln          | natural logarithm            | `ln(2)`                            |
+| length      | length of an array or string | `length("azert")`                  |
+| sin         | sine of a number             | `sin(2)`                           |
+| cos         | cosine of a number           | `cos(2)`                           |
+| tan         | tangent of a number          | `tan(2.2)`                         |
+| print       | print without a newline      | `print("hello")`                   |
+| println     | print with a newline         | `println("hello")`                 |
+| include     | include a script             | `include("scripts/test_fn.adana")` |
+| require     | load a shared object         | `require("my_lib.so")`             |
+| to_int      | cast to int                  | `to_int("2")`<br>`to_int(2.2)`     |
+| to_hex      | format num to hex            | `to_hex(2)`<br>`to_hex(2.2)`       |
+| to_binary   | format num to binary         | `to_binary(2)`                     |
+| to_double   | cast to double               | `to_double("2.2")`                 |
+| to_bool     | cast to bool                 | `to_bool("true")`                  |
+| to_string   | cast to string               | `to_string(true)`                  |
+| drop        | drop a variable from context | `drop("myvar")`<br>`drop(arr[0])`  |
+| eval        | Evaluate a string as code    | `eval("sqrt(9)")`                  |
+| type_of     | Type of variable             | `type_of(true)`                    |
+| is_u8       | Check if u8                  | `is_u8(0x1)`                       |
+| is_i8       | Check if i8                  | `is_i8(-1)`                        |
+| is_int      | Check if int                 | `is_int(512)`                      |
+| is_double   | Check if double              | `is_double(1.2)`                   |
+| is_function | Check if function            | `is_function(()=> {1})`            |
+| is_struct   | Check if struct              | `is_struct(struct {})`             |
+| is_bool     | Check if bool                | `is_bool(false)`                   |
+| is_array    | Check if array               | `is_bool([1,2])`                   |
+| is_error    | Check if error               | `is_error(err)`                    |
+| make_err    | Create an error              | `make_err("oops")`                 |
 
 <hr>
 
diff --git a/adana-playground/.gitignore b/adana-playground/.gitignore
new file mode 100644
index 0000000..5fff1d9
--- /dev/null
+++ b/adana-playground/.gitignore
@@ -0,0 +1 @@
+pkg
diff --git a/adana-playground/README.md b/adana-playground/README.md
new file mode 100644
index 0000000..30382fd
--- /dev/null
+++ b/adana-playground/README.md
@@ -0,0 +1,7 @@
+# adana-playground
+
+## WIP
+
+### todo
+
+- clear the heap
diff --git a/adana-playground/app.js b/adana-playground/app.js
new file mode 100644
index 0000000..0a20071
--- /dev/null
+++ b/adana-playground/app.js
@@ -0,0 +1,112 @@
+import { EXAMPLES } from "./examples.js";
+
+async function loadWasmContext() {
+  const module = await import("./pkg/adana_script_wasm.js");
+  await module.default();
+  return module.compute_as_string;
+}
+
+function toggleForm(form, toggle) {
+  const elements = form.elements;
+  for (let i = 0, len = elements.length; i < len; ++i) {
+    elements[i].readOnly = toggle;
+  }
+  const submitButton = form.querySelector('button[type="submit"]');
+  submitButton.disabled = toggle;
+}
+async function run() {
+  const form = document.querySelector("form");
+  form.classList.add("d-none");
+
+  let compute = await loadWasmContext();
+
+  const memory = new WebAssembly.Memory({
+    initial: 32, // 2mb
+    maximum: 512, // 32mb
+    shared: true,
+  });
+
+  const ctx = new Uint8Array(memory.buffer);
+
+  form.classList.remove("d-none");
+
+  const text_area = document.querySelector("#code");
+  text_area.value = "";
+  text_area.focus();
+
+  const out = document.querySelector("#out");
+  out.value = "";
+
+  let logs = [];
+
+  console.log = function () {
+    for (const a of arguments) {
+      logs.push(a);
+    }
+  };
+
+  const select = document.querySelector("#examples");
+  for (const example of EXAMPLES) {
+    const option = document.createElement("option");
+    option.innerText = example.label;
+    option.value = example.key;
+    select.appendChild(option);
+  }
+
+  select.addEventListener("change", function (e) {
+    const key = e.target.value;
+    const example = EXAMPLES.find((e) => e.key === key);
+    if (example) {
+      text_area.value = example.script;
+    }
+  });
+
+  form.addEventListener("submit", async (e) => {
+    e.preventDefault();
+    toggleForm(form, true);
+    logs = [];
+    out.classList.remove("text-danger");
+
+    const data = new FormData(e.target);
+    for (let i = 0; i < ctx.length; i++) {
+      ctx[i] = undefined;
+    }
+    try {
+      let res = compute(data.get("code") || "", ctx);
+      // console.log(res);
+      out.value = logs.join("");
+      toggleForm(form, false);
+    } catch (e) {
+      out.classList.add("text-danger");
+      out.value = e.toString();
+      compute = await loadWasmContext();
+      toggleForm(form, false);
+    }
+  });
+  const issueLink = document.querySelector("#issueLink");
+  issueLink.onclick = (e) => {
+    e.preventDefault();
+    const a = document.createElement("a");
+    let params = new URLSearchParams();
+    const data = new FormData(form);
+    params.append("title", "Adana playground bug");
+
+    a.href = `https://github.com/nbittich/adana/issues/new?${params.toString()}`;
+    a.target = "_blank";
+    a.click();
+  };
+
+  const copyToClipboardBtn = document.querySelector("#copyToClipboard");
+  copyToClipboardBtn.onclick = function (e) {
+    e.preventDefault();
+    if (out.value) {
+      navigator.clipboard.writeText(out.value);
+
+      alert("Copied to clipboard");
+    } else {
+      alert("Nothing to copy");
+    }
+  };
+}
+
+run();
diff --git a/adana-playground/examples.js b/adana-playground/examples.js
new file mode 100644
index 0000000..6081dd2
--- /dev/null
+++ b/adana-playground/examples.js
@@ -0,0 +1,235 @@
+export const EXAMPLES = [
+  {
+    key: "fizz_buzz",
+    label: "Fizz Buzz",
+    script: `num = 100
+count = 0
+text = ""
+ while count == 0 || count <= num {
+    if count % 3 == 0 && count % 5 == 0 {
+      # Fizz Buzz
+       text = count + " = FizzBuzz"
+       println(text)
+
+    } else if count % 5 == 0 {
+       # buzz
+       text =  count + " = Buzz" # oops
+       println(text)
+    } else if count % 3 == 0 {
+       #fizz
+       text = count + " = Fizz"
+       println(text)
+
+    } else {
+      println(count + " neither fizz nor buzz")
+    }
+    count += 1
+}
+`,
+  },
+  {
+    key: "fib",
+    label: "Fibonnacci",
+    script: `fib = (n) => {
+  a = 0 
+  b = 1
+  c = n 
+  x = null
+  while  n > 1 {
+    n -= 1
+    c = a + b
+    a = b 
+    b = c
+  }
+  c
+}
+
+for i in 0..10 {
+  println("""fib(\${i}): \${fib(i)}""")
+}
+`,
+  },
+  {
+    key: "fact",
+    label: "Factorial",
+    script: `fact = (n) => {
+   if n>=1  {
+    n * fact(n-1)
+   } else {
+     1
+   }
+}
+
+for i in 0..10 {
+  println("""fact(\${i}): \${fact(i)}""")
+}`,
+  },
+  {
+    key: "strings",
+    label: "Strings",
+    script: `v = "eodrnin"
+count = 0
+# we can iterate over a string
+while count < length(v)  {
+    println(v[count])
+    count = count + 1
+}
+
+copy = v
+
+v[0] = copy[6]
+v[2] = copy[3]
+v[3] = copy[2]
+v[4] = copy[5]
+v[5] = copy[6]
+v[6] = copy[0]
+
+i = 0
+
+s = ""
+
+while i < length("kekeke")  {
+    s += "kekeke"[i]
+    i += 1
+}
+
+println(v)
+`,
+  },
+  {
+    key: "sort",
+    label: "Sort array of structs",
+    script: `# sort array of students
+student_1 = struct {
+      first_name: "John",
+      last_name: "Doe",
+      note: 18
+}
+student_2 = struct {
+      first_name: "Jane",
+      last_name: "Dow",
+      note: 9
+}
+
+student_3 = struct {
+      first_name: "Bryan",
+      last_name: "Bower",
+      note: -10
+}
+
+students = [student_1, student_2, student_3]
+
+sort = (students) => {
+          sorted = false
+          while !sorted  {
+              sorted = true
+              len = length(students)-1
+              for i in 0..len {
+                  left = students[i]
+                  right = students[i+1]
+                  if left.note > right.note  {
+                       sorted = false
+                       students[i] = right
+                       students[i+1] = left
+                  }
+              }
+         }
+         students
+}
+
+println(sort(students))
+`,
+  },
+  {
+    key: "arrays",
+    label: "Arrays",
+    script: `# initial array
+arr = ["a", true, "bababa", ("ze" * 4 ), 1, 2.1, 3.]
+
+arr += [69, 420] # append to array
+
+arr *= 2 #  duplicate values in the array
+
+arrlen = length(arr) # length of the array should be 18
+
+copy = []
+
+count = 0
+
+# copy the array one by one 
+while count < arrlen {
+    copy = copy + [arr[count]]
+    count = count + 1
+}
+
+println(length(copy) == length(arr))
+println("""Are same: \${copy == arr}""")
+
+# mutate array
+arr[9]  = "Yolo"
+println(arr)
+
+# fancy list
+i = 9
+list = []
+
+while i !=0 {
+    list = [i, list]
+    i = i -1
+}
+
+# should print [1, [2, [3, [4, [5, [6, [7, [8, [9, []]]]]]]]]]
+println(list)
+
+# should print 2
+println(length(list))
+`,
+  },
+  {
+    key: "maps",
+    label: "Key-Value Map",
+    script: `map = () => {
+    []
+}
+
+push_v = (key, value, m) => {
+    idx = index_of_v(key, m) 
+    if(idx != null) {
+        m[idx] = [key, value]
+    } else {
+        m = [[key, value]] + m
+    }
+    m
+    
+}
+
+get_v = (key, m) => {
+    res = null
+    idx = index_of_v(key,m)
+    if(idx != null) {
+        k = m[idx]
+        res = k[1] 
+    }
+    res
+}
+
+index_of_v = (key, m) => {
+    count = 0
+    res = null
+    while(count < length(m)) {
+        k = m[count]
+        if(k[0] == key) {
+            res = count
+            break
+        } else {
+            count += 1
+        }
+    }
+    res
+}
+
+m = map()
+m = push_v("nordine", 34, m)
+println(get_v("nordine", m))`,
+  },
+];
diff --git a/adana-playground/favicon.ico b/adana-playground/favicon.ico
new file mode 100644
index 0000000..ba94e48
Binary files /dev/null and b/adana-playground/favicon.ico differ
diff --git a/adana-playground/index.html b/adana-playground/index.html
new file mode 100644
index 0000000..f94f537
--- /dev/null
+++ b/adana-playground/index.html
@@ -0,0 +1,69 @@
+<!doctype html>
+<html lang="en" data-bs-theme="dark">
+
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>Adana Playground</title>
+  <link rel="icon" type="image/x-icon" href="favicon.ico" />
+  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet"
+    integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous" />
+  <link rel="stylesheet" href="/style.css" />
+
+  <script type="module" src="./app.js"></script>
+</head>
+
+<body>
+  <div class="ps-1">
+    <h1>Adana Playground</h1>
+    <p>
+      The
+      <a href="https://github.com/nbittich/adana" target="_blank">adana</a>
+      programming language playground. If you find any bug, please
+      <a href="#issueLink" id="issueLink">open an issue.</a>
+    </p>
+  </div>
+  <hr />
+  <div class="overflow-x-hidden">
+    <div class="d-lg-flex justify-content-center d-block">
+      <div class="col-lg-6 col-12 me-lg-1">
+        <form action="" id="scriptForm">
+          <div class="card">
+            <div class="card-header">
+              <div class="d-flex">
+                <button type="submit" class="btn btn-outline-danger text-uppercase me-1">
+                  Run
+                </button>
+                <select name="Examples" id="examples" class="form-select">
+                  <option selected value="">Select an example</option>
+                </select>
+              </div>
+            </div>
+            <div class="card-body m-0 p-0">
+              <textarea required rows="19" id="code" name="code"
+                class="form-control border-0 p-2 terminal h-100 rounded-start-0" aria-describedby="Code"
+                placeholder="# Code goes here" autofocus></textarea>
+            </div>
+          </div>
+        </form>
+      </div>
+      <div class="col-lg-6 col-12 mt-lg-0 mt-2">
+        <div class="card">
+          <div class="card-body m-0 p-0">
+            <div class="card-header">
+              <div class="d-flex justify-content-start">
+                <button class="btn btn-outline-primary text-uppercase" id="copyToClipboard">
+                  Copy Output
+                </button>
+              </div>
+            </div>
+            <textarea required rows="19" id="out" name="out" class="form-control border-0 p-2 terminal"
+              placeholder="# output" disabled></textarea>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</body>
+
+</html>
diff --git a/adana-playground/serve.sh b/adana-playground/serve.sh
new file mode 100644
index 0000000..69a4f71
--- /dev/null
+++ b/adana-playground/serve.sh
@@ -0,0 +1 @@
+python -m http.server 8000
diff --git a/adana-playground/style.css b/adana-playground/style.css
new file mode 100644
index 0000000..b8f7614
--- /dev/null
+++ b/adana-playground/style.css
@@ -0,0 +1,36 @@
+* {
+  --bs-body-bg: black;
+}
+
+.form-select {
+  --bs-border-radius: 0;
+}
+
+.btn {
+  --bs-btn-border-radius: 0;
+}
+
+.card {
+  border-radius: 0 !important;
+}
+
+.terminal {
+  resize: none;
+  border-radius: 0;
+  background-color: var(--bs-body-bg) !important;
+  outline: none !important;
+  caret-color: lime;
+  /* Color of the cursor */
+}
+
+textarea:focus {
+  user-select: none !important;
+  outline: none !important;
+  box-shadow: none !important;
+}
+
+@media (min-width: 720px) {
+  .terminal {
+    height: 82vh !important;
+  }
+}
diff --git a/adana-playground/update.sh b/adana-playground/update.sh
new file mode 100644
index 0000000..85012b3
--- /dev/null
+++ b/adana-playground/update.sh
@@ -0,0 +1,3 @@
+rm -rf pkg
+npm v @nbittich/adana-script-wasm dist.tarball | xargs curl | tar -xz
+mv package pkg
diff --git a/adana-script-core/src/lib.rs b/adana-script-core/src/lib.rs
index 0a4926e..42ee600 100644
--- a/adana-script-core/src/lib.rs
+++ b/adana-script-core/src/lib.rs
@@ -2,9 +2,12 @@ pub mod primitive;
 use std::collections::BTreeMap;
 
 use constants::{
-    BREAK, DROP, ELSE, EULER_NUMBER, FALSE, FOR, IF, IN, MULTILINE, NULL, PI,
-    REQUIRE, RETURN, STRUCT, TAU, TO_BINARY, TO_HEX, TRUE, WHILE,
+    BREAK, DROP, ELSE, EULER_NUMBER, FALSE, FOR, IF, IN, IS_ARRAY, IS_BOOL,
+    IS_DOUBLE, IS_ERROR, IS_FUNCTION, IS_I8, IS_INT, IS_STRUCT, IS_U8,
+    MAKE_ERROR, MULTILINE, NULL, PI, REQUIRE, RETURN, STRUCT, TAU, TO_BINARY,
+    TO_HEX, TRUE, WHILE,
 };
+
 use primitive::Primitive;
 use serde::{Deserialize, Serialize};
 use strum::EnumCount;
@@ -47,6 +50,16 @@ pub mod constants {
     pub const TO_BOOL: &str = "to_bool";
     pub const TO_DOUBLE: &str = "to_double";
     pub const TO_STRING: &str = "to_string";
+    pub const IS_ERROR: &str = "is_error";
+    pub const IS_U8: &str = "is_u8";
+    pub const IS_I8: &str = "is_i8";
+    pub const IS_INT: &str = "is_int";
+    pub const IS_DOUBLE: &str = "is_double";
+    pub const IS_BOOL: &str = "is_bool";
+    pub const IS_FUNCTION: &str = "is_function";
+    pub const IS_ARRAY: &str = "is_array";
+    pub const IS_STRUCT: &str = "is_struct";
+    pub const MAKE_ERROR: &str = "make_err";
     pub const ABS: &str = "abs";
     pub const LENGTH: &str = "length";
     pub const LOG: &str = "log";
@@ -188,6 +201,16 @@ pub enum BuiltInFunctionType {
     Length,
     Include,
     Require,
+    IsError,
+    IsU8,
+    IsI8,
+    IsStruct,
+    IsBool,
+    IsInt,
+    MakeError,
+    IsDouble,
+    IsFunction,
+    IsArray,
 }
 
 #[derive(Debug, Eq, PartialEq, Copy, Clone, Serialize, Deserialize)]
@@ -265,6 +288,16 @@ impl BuiltInFunctionType {
             BuiltInFunctionType::ToDouble => TO_DOUBLE,
             BuiltInFunctionType::ToBool => TO_BOOL,
             BuiltInFunctionType::ToString => TO_STRING,
+            BuiltInFunctionType::IsError => IS_ERROR,
+            BuiltInFunctionType::IsU8 => IS_U8,
+            BuiltInFunctionType::IsI8 => IS_I8,
+            BuiltInFunctionType::IsStruct => IS_STRUCT,
+            BuiltInFunctionType::IsBool => IS_BOOL,
+            BuiltInFunctionType::IsInt => IS_INT,
+            BuiltInFunctionType::IsDouble => IS_DOUBLE,
+            BuiltInFunctionType::IsFunction => IS_FUNCTION,
+            BuiltInFunctionType::IsArray => IS_ARRAY,
+            BuiltInFunctionType::MakeError => MAKE_ERROR,
         }
     }
 }
@@ -315,6 +348,16 @@ pub const FORBIDDEN_VARIABLE_NAME: &[&str] = &[
     TO_HEX,
     TO_BINARY,
     TO_STRING,
+    IS_FUNCTION,
+    IS_DOUBLE,
+    IS_INT,
+    IS_STRUCT,
+    IS_U8,
+    IS_ERROR,
+    IS_I8,
+    IS_BOOL,
+    IS_ARRAY,
+    MAKE_ERROR,
     EVAL,
     TO_BOOL,
     SQRT,
diff --git a/adana-script-core/src/primitive.rs b/adana-script-core/src/primitive.rs
index e0d2b3f..d87c9b3 100644
--- a/adana-script-core/src/primitive.rs
+++ b/adana-script-core/src/primitive.rs
@@ -14,6 +14,21 @@ use super::{constants::NULL, Value};
 
 const MAX_U32_AS_I128: i128 = u32::MAX as i128;
 
+pub const TYPE_U8: &str = "u8";
+pub const TYPE_I8: &str = "i8";
+pub const TYPE_INT: &str = "int";
+pub const TYPE_BOOL: &str = "bool";
+pub const TYPE_NULL: &str = "null";
+pub const TYPE_DOUBLE: &str = "double";
+pub const TYPE_STRING: &str = "string";
+pub const TYPE_ARRAY: &str = "array";
+pub const TYPE_ERROR: &str = "error";
+pub const TYPE_NATIVE_LIB: &str = "nativeLibrary";
+pub const TYPE_FUNCTION: &str = "function";
+pub const TYPE_UNIT: &str = "unit";
+pub const TYPE_STRUCT: &str = "struct";
+pub const TYPE_NO_RETURN: &str = "!";
+
 #[derive(Debug)]
 pub struct NativeLibrary {
     #[cfg(target_arch = "wasm32")]
@@ -192,6 +207,7 @@ impl Primitive {
 
 pub trait TypeOf {
     fn type_of(&self) -> Self;
+    fn type_of_str(&self) -> &'static str;
 }
 pub trait BitShift {
     fn left_shift(&self, n: &Self) -> Self;
@@ -1711,34 +1727,36 @@ impl PartialOrd for Primitive {
 }
 
 impl TypeOf for Primitive {
-    fn type_of(&self) -> Self {
+    fn type_of_str(&self) -> &'static str {
         match self {
             Primitive::Ref(l) => {
                 let l =
                     l.read().expect("TYPE_OF ERROR: could not acquire lock!");
-                l.type_of()
-            }
-            Primitive::U8(_) => Primitive::String("u8".to_string()),
-            Primitive::I8(_) => Primitive::String("i8".to_string()),
-            Primitive::Int(_) => Primitive::String("int".to_string()),
-            Primitive::Bool(_) => Primitive::String("bool".to_string()),
-            Primitive::Null => Primitive::String("null".to_string()),
-            Primitive::Double(_) => Primitive::String("double".to_string()),
-            Primitive::String(_) => Primitive::String("string".to_string()),
-            Primitive::Array(_) => Primitive::String("array".to_string()),
-            Primitive::Error(_) => Primitive::String("error".to_string()),
-            Primitive::NativeLibrary(_) => {
-                Primitive::String("nativeLibrary".into())
-            }
+                l.type_of_str()
+            }
+            Primitive::U8(_) => TYPE_U8,
+            Primitive::I8(_) => TYPE_I8,
+            Primitive::Int(_) => TYPE_INT,
+            Primitive::Bool(_) => TYPE_BOOL,
+            Primitive::Null => TYPE_NULL,
+            Primitive::Double(_) => TYPE_DOUBLE,
+            Primitive::String(_) => TYPE_STRING,
+            Primitive::Array(_) => TYPE_ARRAY,
+            Primitive::Error(_) => TYPE_ERROR,
+            Primitive::NativeLibrary(_) => TYPE_NATIVE_LIB,
             Primitive::Function { .. } | Primitive::NativeFunction(_, _) => {
-                Primitive::String("function".to_string())
+                TYPE_FUNCTION
             }
-            Primitive::Struct(_) => Primitive::String("struct".to_string()),
-            Primitive::Unit => Primitive::String("unit".to_string()),
-            Primitive::NoReturn => Primitive::String("!".to_string()),
-            Primitive::EarlyReturn(v) => v.type_of(),
+            Primitive::Struct(_) => TYPE_STRUCT,
+            Primitive::Unit => TYPE_UNIT,
+            Primitive::NoReturn => TYPE_NO_RETURN,
+            Primitive::EarlyReturn(v) => v.type_of_str(),
         }
     }
+
+    fn type_of(&self) -> Self {
+        Primitive::String(self.type_of_str().to_string())
+    }
 }
 
 impl Array for Primitive {
diff --git a/adana-script-wasm/Cargo.toml b/adana-script-wasm/Cargo.toml
index 49b28aa..95b242b 100644
--- a/adana-script-wasm/Cargo.toml
+++ b/adana-script-wasm/Cargo.toml
@@ -20,6 +20,8 @@ crate-type = ["cdylib", "rlib"]
 default = ["wee_alloc", "console_error_panic_hook"]
 
 [dependencies]
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
 wasm-bindgen = { workspace = true }
 adana-script.workspace = true
 adana-script-core.workspace = true
diff --git a/adana-script-wasm/src/lib.rs b/adana-script-wasm/src/lib.rs
index 166ef48..a864141 100644
--- a/adana-script-wasm/src/lib.rs
+++ b/adana-script-wasm/src/lib.rs
@@ -1,16 +1,18 @@
+#![cfg(target_arch = "wasm32")]
+
 mod utils;
-use adana_script_core::primitive::RefPrimitive;
+use adana_script_core::primitive::{Primitive, RefPrimitive};
 use std::collections::BTreeMap;
 use wasm_bindgen::prelude::*;
 
 #[global_allocator]
 static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
 
-#[wasm_bindgen]
-pub fn compute(script: &str, mem: &mut [u8]) -> Result<JsValue, JsError> {
+fn compute(
+    script: &str,
+    mem: &mut [u8],
+) -> Result<(BTreeMap<String, RefPrimitive>, Primitive), JsError> {
     utils::set_panic_hook();
-    // wasm memory:
-    // https://developer.mozilla.org/fr/docs/WebAssembly/JavaScript_interface/Memory
     let mut ctx: BTreeMap<String, RefPrimitive> = if !mem.is_empty() {
         bincode::deserialize(mem)?
     } else {
@@ -21,6 +23,49 @@ pub fn compute(script: &str, mem: &mut [u8]) -> Result<JsValue, JsError> {
         .map_err(|e| e.to_string())
         .map_err(|e| JsError::new(&e))?;
 
+    Ok((ctx, result))
+}
+#[wasm_bindgen]
+pub fn compute_as_js_value(
+    script: &str,
+    mem: &mut [u8],
+) -> Result<JsValue, JsError> {
+    let (ctx, result) = compute(script, mem)?;
     bincode::serialize_into(mem, &ctx)?;
+
     Ok(serde_wasm_bindgen::to_value(&result)?)
 }
+
+#[wasm_bindgen]
+pub fn compute_as_string(
+    script: &str,
+    mem: &mut [u8],
+) -> Result<String, JsError> {
+    let (ctx, result) = compute(script, mem)?;
+
+    let result = {
+        if let Some(out) = ctx.get("") {
+            let mut out_rl = out.write()?;
+
+            match &mut *out_rl {
+                Primitive::Array(ref mut a) if !a.is_empty() => {
+                    let mut s = String::new();
+                    for p in a.drain(0..) {
+                        s.push_str(&p.to_string());
+                    }
+                    if !matches!(result, Primitive::Unit) {
+                        s.push_str(&result.to_string());
+                    }
+
+                    Ok(s)
+                }
+                _ => Ok(result.to_string()),
+            }
+        } else {
+            Ok(result.to_string())
+        }
+    };
+    bincode::serialize_into(mem, &ctx)?;
+
+    result
+}
diff --git a/adana-script-wasm/tests/web.rs b/adana-script-wasm/tests/web.rs
index 4b95afd..3d71008 100644
--- a/adana-script-wasm/tests/web.rs
+++ b/adana-script-wasm/tests/web.rs
@@ -5,19 +5,20 @@
 extern crate wasm_bindgen_test;
 
 use adana_script_core::primitive::{Primitive, RefPrimitive};
-use adana_script_wasm::compute;
+use adana_script_wasm::compute_as_js_value;
 use std::assert_eq;
 use std::collections::BTreeMap;
 use wasm_bindgen::JsValue;
 use wasm_bindgen_test::*;
+
 wasm_bindgen_test_configure!(run_in_browser);
 
 #[wasm_bindgen_test]
-fn compute_test() {
+fn compute_as_js_value_test() {
     let mut memory = vec![0; 64];
-    let res = compute("x = 1+1", &mut memory).map_err(JsValue::from).unwrap();
-
-    //wasm_bindgen_test::console_log!("{memory:?}");
+    let res = compute_as_js_value("x = 1+1", &mut memory)
+        .map_err(JsValue::from)
+        .unwrap();
     let res: Primitive = serde_wasm_bindgen::from_value(res).unwrap();
     assert_eq!(Primitive::Int(2), res);
     let ctx: BTreeMap<String, RefPrimitive> =
diff --git a/adana-script/Cargo.toml b/adana-script/Cargo.toml
index 5fba23e..680c75a 100644
--- a/adana-script/Cargo.toml
+++ b/adana-script/Cargo.toml
@@ -17,6 +17,11 @@ adana-script-core.workspace = true
 anyhow.workspace = true
 slab_tree.workspace = true
 
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+web-sys = { workspace = true, features = ["console"] }
+wasm-bindgen.workspace = true
+
 [dev-dependencies]
 # some test must run sequentially. 
 # if library is broken, alternative is: cargo test -- --test-threads 1
diff --git a/adana-script/dynamic_lib/example_lib_src/Cargo.lock b/adana-script/dynamic_lib/example_lib_src/Cargo.lock
index 26ad186..6721b67 100644
--- a/adana-script/dynamic_lib/example_lib_src/Cargo.lock
+++ b/adana-script/dynamic_lib/example_lib_src/Cargo.lock
@@ -4,14 +4,11 @@ version = 3
 
 [[package]]
 name = "adana-script-core"
-version = "0.16.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa8a7bb732df5f039dcadd732decc5d1f77c4ab72cc595a1b7d359ea9bfe98ba"
+version = "0.17.2"
 dependencies = [
  "anyhow",
  "libloading",
  "serde",
- "serde_derive",
  "strum",
 ]
 
diff --git a/adana-script/dynamic_lib/example_lib_src/Cargo.toml b/adana-script/dynamic_lib/example_lib_src/Cargo.toml
index beca582..1949584 100644
--- a/adana-script/dynamic_lib/example_lib_src/Cargo.toml
+++ b/adana-script/dynamic_lib/example_lib_src/Cargo.toml
@@ -11,7 +11,7 @@ edition = "2021"
 crate-type = ["dylib"]
 
 [dependencies]
-adana-script-core = "0.16.1"
+adana-script-core = { path = "./../../../adana-script-core" }
 #adana-script-core = { git = "https://github.com/nbittich/adana-script-core.git", branch = "feature/bitwise-and-new-ints" }
 
 anyhow = "1.0.79"
diff --git a/adana-script/dynamic_lib/libplugin_example.so b/adana-script/dynamic_lib/libplugin_example.so
index deaa7a9..4c3207b 100755
Binary files a/adana-script/dynamic_lib/libplugin_example.so and b/adana-script/dynamic_lib/libplugin_example.so differ
diff --git a/adana-script/examples/example1.adana b/adana-script/examples/example1.adana
index 56fd9c9..a28dad9 100644
--- a/adana-script/examples/example1.adana
+++ b/adana-script/examples/example1.adana
@@ -22,13 +22,13 @@ students = [student_1, student_2, student_3]
 
 sort = (students) => {
           sorted = false
-          while(!sorted) {
+          while !sorted  {
               sorted = true
               len = length(students)-1
               for i in 0..len {
                   left = students[i]
                   right = students[i+1]
-                  if(left.note > right.note) {
+                  if left.note > right.note  {
                        sorted = false
                        students[i] = right
                        students[i+1] = left
diff --git a/adana-script/file_tests/string.adana b/adana-script/file_tests/string.adana
index b557996..6eeaaa9 100644
--- a/adana-script/file_tests/string.adana
+++ b/adana-script/file_tests/string.adana
@@ -11,12 +11,12 @@ split = (s, c) => {
     count = 0
     while count < length(s) {
         curr = s[count]
-        if(buf == "aka") {
+        if buf == "aka"  {
             return [buf]
         }
-        if(curr != c) {
+        if curr != c  {
             buf = buf + s[count]
-        }else{
+        } else {
             res = res + [buf]
             buf = ""
         }
diff --git a/adana-script/file_tests/test_fizzbuzz_else.adana b/adana-script/file_tests/test_fizzbuzz_else.adana
index 446da1b..305e173 100644
--- a/adana-script/file_tests/test_fizzbuzz_else.adana
+++ b/adana-script/file_tests/test_fizzbuzz_else.adana
@@ -2,7 +2,7 @@ count = -1
 
 text = ""
 while count <= 100 {
-    count = count + 1
+    count += 1
     if count % 3 == 0 && count % 5 == 0 {
       # Fizz Buzz
        text = count + " = FizzBuzz"
diff --git a/adana-script/src/compute.rs b/adana-script/src/compute.rs
index 7aa53a9..08c6009 100644
--- a/adana-script/src/compute.rs
+++ b/adana-script/src/compute.rs
@@ -10,11 +10,14 @@ use std::{
 use crate::{parser::parse_instructions, prelude::BTreeMap};
 
 use super::{ast::to_ast, require_dynamic_lib::require_dynamic_lib};
+
 use adana_script_core::{
     primitive::{
         Abs, Add, And, Array, BitShift, Cos, DisplayBinary, DisplayHex, Div,
         Logarithm, Mul, Neg, Not, Or, Pow, Primitive, RefPrimitive, Rem, Sin,
-        Sqrt, Sub, Tan, ToBool, ToNumber, TypeOf,
+        Sqrt, Sub, Tan, ToBool, ToNumber, TypeOf, TYPE_ARRAY, TYPE_BOOL,
+        TYPE_DOUBLE, TYPE_ERROR, TYPE_FUNCTION, TYPE_I8, TYPE_INT, TYPE_STRUCT,
+        TYPE_U8,
     },
     BuiltInFunctionType, Operator, TreeNodeValue, Value,
 };
@@ -349,12 +352,36 @@ fn compute_recur(
                         Ok(v.len())
                     }
                     adana_script_core::BuiltInFunctionType::Println => {
-                        println!("{v}");
-                        Ok(Primitive::Unit)
+                        #[cfg(not(target_arch = "wasm32"))]
+                        {
+                            println!("{v}");
+                            Ok(Primitive::Unit)
+                        }
+                        #[cfg(target_arch = "wasm32")]
+                        {
+                            web_sys::console::log_1(
+                                &wasm_bindgen::JsValue::from_str(&format!(
+                                    "{v}\n"
+                                )),
+                            );
+                            Ok(Primitive::Unit)
+                        }
                     }
                     adana_script_core::BuiltInFunctionType::Print => {
-                        print!("{v}");
-                        Ok(Primitive::Unit)
+                        #[cfg(not(target_arch = "wasm32"))]
+                        {
+                            print!("{v}");
+                            Ok(Primitive::Unit)
+                        }
+                        #[cfg(target_arch = "wasm32")]
+                        {
+                            web_sys::console::log_1(
+                                &wasm_bindgen::JsValue::from_str(&format!(
+                                    "{v}"
+                                )),
+                            );
+                            Ok(Primitive::Unit)
+                        }
                     }
                     adana_script_core::BuiltInFunctionType::Require => {
                         match v {
@@ -435,6 +462,36 @@ fn compute_recur(
                     adana_script_core::BuiltInFunctionType::TypeOf => {
                         Ok(v.type_of())
                     }
+                    adana_script_core::BuiltInFunctionType::IsError => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_ERROR))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsU8 => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_U8))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsI8 => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_I8))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsStruct => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_STRUCT))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsBool => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_BOOL))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsInt => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_INT))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsDouble => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_DOUBLE))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsFunction => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_FUNCTION))
+                    }
+                    adana_script_core::BuiltInFunctionType::IsArray => {
+                        Ok(Primitive::Bool(v.type_of_str() == TYPE_ARRAY))
+                    }
+                    adana_script_core::BuiltInFunctionType::MakeError => {
+                        Ok(Primitive::Error(v.to_string()))
+                    }
                 }
             }
             TreeNodeValue::IfExpr(v) => {
diff --git a/adana-script/src/parser.rs b/adana-script/src/parser.rs
index 55cda74..e742aea 100644
--- a/adana-script/src/parser.rs
+++ b/adana-script/src/parser.rs
@@ -415,26 +415,42 @@ fn parse_builtin_fn(s: &str) -> Res<Value> {
         }
     }
     alt((
-        parse_builtin(BuiltInFunctionType::Sqrt),
-        parse_builtin(BuiltInFunctionType::Abs),
-        parse_builtin(BuiltInFunctionType::Ln),
-        parse_builtin(BuiltInFunctionType::Log),
-        parse_builtin(BuiltInFunctionType::Sin),
-        parse_builtin(BuiltInFunctionType::Cos),
-        parse_builtin(BuiltInFunctionType::ToInt),
-        parse_builtin(BuiltInFunctionType::ToDouble),
-        parse_builtin(BuiltInFunctionType::ToHex),
-        parse_builtin(BuiltInFunctionType::ToBinary),
-        parse_builtin(BuiltInFunctionType::TypeOf),
-        parse_builtin(BuiltInFunctionType::ToBool),
-        parse_builtin(BuiltInFunctionType::ToString),
         parse_builtin(BuiltInFunctionType::Eval),
-        parse_builtin(BuiltInFunctionType::Tan),
         parse_builtin(BuiltInFunctionType::Println),
         parse_builtin(BuiltInFunctionType::Print),
         parse_builtin(BuiltInFunctionType::Length),
         parse_builtin(BuiltInFunctionType::Include),
         parse_builtin(BuiltInFunctionType::Require),
+        parse_builtin(BuiltInFunctionType::MakeError),
+        alt((
+            parse_builtin(BuiltInFunctionType::IsU8),
+            parse_builtin(BuiltInFunctionType::IsI8),
+            parse_builtin(BuiltInFunctionType::IsInt),
+            parse_builtin(BuiltInFunctionType::IsDouble),
+            parse_builtin(BuiltInFunctionType::IsError),
+            parse_builtin(BuiltInFunctionType::IsStruct),
+            parse_builtin(BuiltInFunctionType::IsFunction),
+            parse_builtin(BuiltInFunctionType::IsBool),
+            parse_builtin(BuiltInFunctionType::IsArray),
+        )),
+        alt((
+            parse_builtin(BuiltInFunctionType::ToHex),
+            parse_builtin(BuiltInFunctionType::ToBinary),
+            parse_builtin(BuiltInFunctionType::TypeOf),
+            parse_builtin(BuiltInFunctionType::ToInt),
+            parse_builtin(BuiltInFunctionType::ToDouble),
+            parse_builtin(BuiltInFunctionType::ToBool),
+            parse_builtin(BuiltInFunctionType::ToString),
+        )),
+        alt((
+            parse_builtin(BuiltInFunctionType::Sqrt),
+            parse_builtin(BuiltInFunctionType::Abs),
+            parse_builtin(BuiltInFunctionType::Tan),
+            parse_builtin(BuiltInFunctionType::Ln),
+            parse_builtin(BuiltInFunctionType::Log),
+            parse_builtin(BuiltInFunctionType::Sin),
+            parse_builtin(BuiltInFunctionType::Cos),
+        )),
         // parse_builtin(BuiltInFunctionType::ReadLines),
     ))(s)
 }
diff --git a/adana-script/src/tests/is_type.rs b/adana-script/src/tests/is_type.rs
new file mode 100644
index 0000000..e9a2ea0
--- /dev/null
+++ b/adana-script/src/tests/is_type.rs
@@ -0,0 +1,78 @@
+use std::collections::BTreeMap;
+
+use adana_script_core::primitive::Primitive;
+
+use crate::compute;
+
+#[test]
+fn test_is_u8() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_u8(0x1)", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_i8() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_i8(-1)", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_int() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_int(512)", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_double() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_double(512.)", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_function() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_function(()=> {1})", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_struct() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_struct(struct {})", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_bool() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_bool(false)", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_array() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_array([1,2,3])", &mut ctx, "N/A").unwrap()
+    );
+}
+#[test]
+fn test_is_error() {
+    let mut ctx = BTreeMap::new();
+    assert_eq!(
+        Primitive::Bool(true),
+        compute("is_error(make_err(8))", &mut ctx, "N/A").unwrap()
+    );
+}
diff --git a/adana-script/src/tests/mod.rs b/adana-script/src/tests/mod.rs
index 096f168..d4e4b58 100644
--- a/adana-script/src/tests/mod.rs
+++ b/adana-script/src/tests/mod.rs
@@ -4,6 +4,7 @@ mod dynload;
 mod examples;
 mod foreach;
 mod funct;
+mod is_type;
 mod misc;
 mod opassign;
 mod range;
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 6d833ff..83a52c3 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.75"
+channel = "1.76"