diff --git a/Cargo.lock b/Cargo.lock
index 958c4be..263a810 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -74,7 +74,6 @@ dependencies = [
  "num-complex",
  "num-rational",
  "num-traits",
- "paste",
  "strum",
 ]
 
@@ -84,10 +83,21 @@ version = "0.1.0"
 dependencies = [
  "backtrace",
  "complexpr",
+ "complexpr-stdlib",
  "rustyline",
  "rustyline-derive",
 ]
 
+[[package]]
+name = "complexpr-stdlib"
+version = "0.1.0"
+dependencies = [
+ "complexpr",
+ "lazy_static",
+ "num-traits",
+ "paste",
+]
+
 [[package]]
 name = "dirs-next"
 version = "2.0.0"
@@ -186,6 +196,12 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ea37f355c05dde75b84bba2d767906ad522e97cd9e2eef2be7a4ab7fb442c06"
 
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
 [[package]]
 name = "libc"
 version = "0.2.132"
diff --git a/Cargo.toml b/Cargo.toml
index 8d1b996..d619803 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,2 +1,2 @@
 [workspace]
-members = [ "complexpr-bin", "complexpr" ]
+members = [ "complexpr-bin", "complexpr", "complexpr-stdlib" ]
diff --git a/complexpr-bin/Cargo.toml b/complexpr-bin/Cargo.toml
index b1d9734..861ec71 100644
--- a/complexpr-bin/Cargo.toml
+++ b/complexpr-bin/Cargo.toml
@@ -7,6 +7,7 @@ edition = "2021"
 
 [dependencies]
 complexpr = { path = "../complexpr" }
+complexpr-stdlib = { path = "../complexpr-stdlib" }
 backtrace = "0.3.66"
 rustyline = { version = "10.0.0", optional = true }
 rustyline-derive = { version = "0.7.0", optional = true }
diff --git a/complexpr-bin/src/main.rs b/complexpr-bin/src/main.rs
index 34b3f55..496d111 100644
--- a/complexpr-bin/src/main.rs
+++ b/complexpr-bin/src/main.rs
@@ -1,7 +1,7 @@
 use std::{fs, panic::{self, PanicInfo}, process::ExitCode};
 
 use backtrace::Backtrace;
-use complexpr::{interpreter::interpret};
+use complexpr::{interpreter::interpret, env::Environment};
 
 mod helper;
 mod repl;
@@ -22,10 +22,21 @@ fn panic_hook(info: &PanicInfo) {
     }
 }
 
+fn create_env() -> Environment {
+    let mut env = Environment::new();
+
+    complexpr_stdlib::prelude::load(&mut env);
+    complexpr_stdlib::io::load(&mut env);
+    complexpr_stdlib::iter::load(&mut env);
+    complexpr_stdlib::math::load(&mut env);
+
+    env
+}
+
 fn main() -> ExitCode {
     panic::set_hook(Box::new(panic_hook));
     let args: Vec<String> = std::env::args().collect();
-    if args.len() == 2 {
+    if args.len() >= 2 {
         let fname = &args[1];
         let src = match fs::read_to_string(fname) {
             Ok(src) => src,
@@ -34,7 +45,10 @@ fn main() -> ExitCode {
                 return ExitCode::from(2);
             }
         };
-        let res = interpret(&src, Some(fname.into()), None, false);
+
+        let env = create_env().wrap();
+
+        let res = interpret(&src, Some(fname.into()), Some(env), false);
         if let Err(e) = res {
             eprintln!("Error: {}", e);
             return ExitCode::from(1);
diff --git a/complexpr-bin/src/repl.rs b/complexpr-bin/src/repl.rs
index feee4d9..8c791db 100644
--- a/complexpr-bin/src/repl.rs
+++ b/complexpr-bin/src/repl.rs
@@ -1,9 +1,10 @@
 #![cfg(feature = "repl")]
 
 use rustyline::{self, error::ReadlineError, Config, CompletionType, EditMode, hint::HistoryHinter, validate::MatchingBracketValidator, Editor};
-use complexpr::{env::Environment, interpreter::interpret, value::Value, stdlib};
+use complexpr::{interpreter::interpret, value::Value};
 
-use crate::helper::CxprHelper;
+
+use crate::{helper::CxprHelper, create_env};
 
 const C_RESET: &str = "\x1b[0m";
 const C_BLUE: &str = "\x1b[94m";
@@ -17,7 +18,7 @@ pub fn repl() -> Result<(), Box<dyn std::error::Error>> {
         .edit_mode(EditMode::Emacs)
         .build();
 
-    let env = Environment::new().wrap();
+    let env = create_env().wrap();
 
     let h = CxprHelper {
         hinter: HistoryHinter {},
@@ -36,11 +37,6 @@ pub fn repl() -> Result<(), Box<dyn std::error::Error>> {
 
     println!("Press {}Ctrl+D{} to exit.", C_BLUE, C_RESET);
 
-    stdlib::load(&mut env.borrow_mut());
-    stdlib::io::load(&mut env.borrow_mut());
-    stdlib::iter::load(&mut env.borrow_mut());
-    stdlib::math::load(&mut env.borrow_mut());
-
     loop {
         let readline = rl.readline(">> ");
         match readline {
diff --git a/complexpr-stdlib/Cargo.toml b/complexpr-stdlib/Cargo.toml
new file mode 100644
index 0000000..04981cf
--- /dev/null
+++ b/complexpr-stdlib/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "complexpr-stdlib"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+complexpr = { path = "../complexpr"}
+num-traits = "0.2.15"
+paste = "1.0.9"
+lazy_static = "1.4.0"
diff --git a/complexpr/src/stdlib/io.rs b/complexpr-stdlib/src/io.rs
similarity index 90%
rename from complexpr/src/stdlib/io.rs
rename to complexpr-stdlib/src/io.rs
index 679a179..94e7662 100644
--- a/complexpr/src/stdlib/io.rs
+++ b/complexpr-stdlib/src/io.rs
@@ -1,6 +1,8 @@
 use std::{io::{Write, Read}, fs::{OpenOptions, File}, rc::Rc, cell::RefCell, fmt};
 
-use crate::{env::Environment, declare_fn, value::{Value, Native, TypeData}, RuntimeError};
+use complexpr::{env::Environment, value::{Value, Native, TypeData}, RuntimeError};
+
+use crate::declare_fn;
 
 pub fn load(env: &mut Environment) {
     declare_fn!(env, print, 1);
@@ -37,7 +39,7 @@ struct FileBox {
 }
 
 lazy_static::lazy_static! {
-    static ref FILE_TYPE_ID: usize = crate::value::generate_type_id();
+    static ref FILE_TYPE_ID: usize = complexpr::value::generate_type_id();
 }
 thread_local!(static FILE_TYPE_NAME: Rc<str> = Rc::from("File"));
 
@@ -50,8 +52,8 @@ impl Native for FileBox {
         self
     }
 
-    fn get_type(&self) -> crate::value::Type {
-        crate::value::Type { name: FILE_TYPE_NAME.with(Rc::clone), id: *FILE_TYPE_ID, typedata: TypeData::None }
+    fn get_type(&self) -> complexpr::value::Type {
+        complexpr::value::Type { name: FILE_TYPE_NAME.with(Rc::clone), id: *FILE_TYPE_ID, typedata: TypeData::None }
         
     }
 }
diff --git a/complexpr/src/stdlib/iter.rs b/complexpr-stdlib/src/iter.rs
similarity index 96%
rename from complexpr/src/stdlib/iter.rs
rename to complexpr-stdlib/src/iter.rs
index 0888506..b6469c0 100644
--- a/complexpr/src/stdlib/iter.rs
+++ b/complexpr-stdlib/src/iter.rs
@@ -1,6 +1,8 @@
 use std::{rc::Rc, cell::RefCell};
 
-use crate::{value::{Value, func::Func}, RuntimeError, env::Environment, declare_fn};
+use complexpr::{value::{Value, func::Func}, RuntimeError, env::Environment};
+
+use crate::declare_fn;
 
 pub fn load(env: &mut Environment) {
     declare_fn!(env, take, 2);
diff --git a/complexpr-stdlib/src/lib.rs b/complexpr-stdlib/src/lib.rs
new file mode 100644
index 0000000..6ab207a
--- /dev/null
+++ b/complexpr-stdlib/src/lib.rs
@@ -0,0 +1,16 @@
+pub mod prelude;
+pub mod io;
+pub mod iter;
+pub mod math;
+
+#[macro_export]
+macro_rules! declare_fn {
+    ($env:ident, $name:ident, $arg_count:literal) => {::paste::paste!{{
+        let s: ::std::rc::Rc<str> = ::std::rc::Rc::from(stringify!($name));
+        $env.declare(s.clone(), ::complexpr::value::Value::Func(::complexpr::value::func::Func::Builtin { func: [<fn_ $name>], arg_count: $arg_count, name: s }));
+    }}};
+    ($env:ident, $name:literal, $rust_name:ident, $arg_count:literal) => {{
+        let s: ::std::rc::Rc<str> = ::std::rc::Rc::from($name);
+        $env.declare(s.clone(), ::complexpr::value::Value::Func(::complexpr::value::func::Func::Builtin { func: $rust_name, arg_count: $arg_count, name: s }));
+    }};
+}
diff --git a/complexpr/src/stdlib/math.rs b/complexpr-stdlib/src/math.rs
similarity index 98%
rename from complexpr/src/stdlib/math.rs
rename to complexpr-stdlib/src/math.rs
index 01c09d6..a10a658 100644
--- a/complexpr/src/stdlib/math.rs
+++ b/complexpr-stdlib/src/math.rs
@@ -2,7 +2,9 @@ use std::cmp::Ordering;
 
 use num_traits::{ToPrimitive, Pow, Signed};
 
-use crate::{value::{Value, Complex, Rational}, RuntimeError, env::Environment, declare_fn};
+use complexpr::{value::{Value, Complex, Rational}, RuntimeError, env::Environment};
+
+use crate::declare_fn;
 
 enum Floaty {
     Real(f64), Complex(Complex)
diff --git a/complexpr/src/stdlib/mod.rs b/complexpr-stdlib/src/prelude.rs
similarity index 88%
rename from complexpr/src/stdlib/mod.rs
rename to complexpr-stdlib/src/prelude.rs
index be8eb8f..ce6a5a4 100644
--- a/complexpr/src/stdlib/mod.rs
+++ b/complexpr-stdlib/src/prelude.rs
@@ -1,22 +1,8 @@
-pub mod io;
-pub mod iter;
-pub mod math;
-
 use std::{time::{SystemTime, UNIX_EPOCH}, rc::Rc, cell::RefCell};
 
-use crate::{value::{Value, func::Func}, RuntimeError, env::Environment};
+use complexpr::{value::{Value, func::Func}, RuntimeError, env::Environment};
 
-#[macro_export]
-macro_rules! declare_fn {
-    ($env:ident, $name:ident, $arg_count:literal) => {::paste::paste!{{
-        let s: ::std::rc::Rc<str> = ::std::rc::Rc::from(stringify!($name));
-        $env.declare(s.clone(), $crate::value::Value::Func($crate::value::func::Func::Builtin { func: [<fn_ $name>], arg_count: $arg_count, name: s }));
-    }}};
-    ($env:ident, $name:literal, $rust_name:ident, $arg_count:literal) => {{
-        let s: ::std::rc::Rc<str> = ::std::rc::Rc::from($name);
-        $env.declare(s.clone(), $crate::value::Value::Func($crate::value::func::Func::Builtin { func: $rust_name, arg_count: $arg_count, name: s }));
-    }};
-}
+use crate::declare_fn;
 
 pub fn load(env: &mut Environment) {
     declare_fn!(env, "type", fn_type, 1);
diff --git a/complexpr/Cargo.toml b/complexpr/Cargo.toml
index 1d1825c..9a6a629 100644
--- a/complexpr/Cargo.toml
+++ b/complexpr/Cargo.toml
@@ -8,5 +8,3 @@ num-complex = "0.4.2"
 num-rational = "0.4.1"
 num-traits = "0.2.15"
 strum = { version = "0.24.1", features = ["derive"] }
-paste = "1.0.9"
-lazy_static = "1.4.0"
diff --git a/complexpr/src/interpreter.rs b/complexpr/src/interpreter.rs
index d92ce8f..52530d7 100644
--- a/complexpr/src/interpreter.rs
+++ b/complexpr/src/interpreter.rs
@@ -1,6 +1,6 @@
 use std::{cell::RefCell, rc::Rc};
 
-use crate::{value::Value, lexer::Lexer, parser::Parser, eval::{eval_stmt, eval_expr}, expr::Stmt, stdlib, env::{EnvRef, Environment}};
+use crate::{value::Value, lexer::Lexer, parser::Parser, eval::{eval_stmt, eval_expr}, expr::Stmt, env::{EnvRef, Environment}};
 
 pub fn interpret(src: &str, fname: Option<String>, env: Option<EnvRef>, repl: bool) -> Result<Value, Box<dyn std::error::Error>> {
     let ctx_name = if repl { "<interactive input>" } else { fname.as_ref().map(|s| s.as_ref()).unwrap_or("<unknown>") };
@@ -13,10 +13,6 @@ pub fn interpret(src: &str, fname: Option<String>, env: Option<EnvRef>, repl: bo
         environ = env;
     } else {
         environ = Rc::new(RefCell::new(Environment::new()));
-        stdlib::load(&mut environ.borrow_mut());
-        stdlib::io::load(&mut environ.borrow_mut());
-        stdlib::iter::load(&mut environ.borrow_mut());
-        stdlib::math::load(&mut environ.borrow_mut());
     }
 
     let mut result = Value::Nil;
diff --git a/complexpr/src/lib.rs b/complexpr/src/lib.rs
index ea3db59..160c104 100644
--- a/complexpr/src/lib.rs
+++ b/complexpr/src/lib.rs
@@ -8,7 +8,6 @@ pub mod value;
 pub mod eval;
 pub mod interpreter;
 pub mod env;
-pub mod stdlib;
 
 #[derive(Clone, Debug)]
 pub struct Position {