diff --git a/talc-bin/src/repl.rs b/talc-bin/src/repl.rs
index 6050cbb..0a448e7 100644
--- a/talc-bin/src/repl.rs
+++ b/talc-bin/src/repl.rs
@@ -101,11 +101,12 @@ fn read_init_file(args: &Args) -> Result<Option<String>, std::io::Error> {
 fn exec_line(
 	vm: &mut Vm,
 	line: &str,
+	line_no: u32,
 	args: &Args,
 	c: &ReplColors,
 	globals: &mut Vec<Symbol>,
 ) {
-	let mut ex = match parser::parse(line) {
+	let mut ex = match parser::parse_from(line, line_no) {
 		Ok(ex) => ex,
 		Err(e) => {
 			eprintln!("{}Error:{} {e}", c.error, c.reset);
@@ -192,11 +193,13 @@ pub fn repl(args: &Args) -> ExitCode {
 	};
 
 	let vm = Rc::new(RefCell::new(vm));
+	let mut line_no = 1;
 
 	rl.set_helper(Some(TalcHelper::new(vm.clone())));
 
 	if let Some(src) = init_src {
-		exec_line(&mut vm.borrow_mut(), &src, args, &c, &mut globals);
+		exec_line(&mut vm.borrow_mut(), &src, line_no, args, &c, &mut globals);
+		line_no += 1;
 	}
 
 	loop {
@@ -214,6 +217,7 @@ pub fn repl(args: &Args) -> ExitCode {
 			}
 		};
 
-		exec_line(&mut vm.borrow_mut(), &line, args, &c, &mut globals);
+		exec_line(&mut vm.borrow_mut(), &line, line_no, args, &c, &mut globals);
+		line_no += 1;
 	}
 }
diff --git a/talc-lang/src/chunk.rs b/talc-lang/src/chunk.rs
index 107e115..e75131b 100644
--- a/talc-lang/src/chunk.rs
+++ b/talc-lang/src/chunk.rs
@@ -240,6 +240,7 @@ pub struct TryTable {
 
 #[derive(Clone, Debug, Default)]
 pub struct Chunk {
+	pub lines: Vec<(u32, u32)>,
 	pub consts: Vec<Value>,
 	pub instrs: Vec<Instruction>,
 	pub try_tables: Vec<TryTable>,
@@ -250,6 +251,26 @@ impl Chunk {
 		Self::default()
 	}
 
+	pub fn set_line(&mut self, line: u32) {
+		let instr = self.instrs.len() as u32;
+		if let Some((i, l)) = self.lines.last_mut() {
+			if *i == instr {
+				*l = line;
+				return
+			}
+		}
+		self.lines.push((instr, line));
+	}
+
+	pub fn get_line(&self, instr: u32) -> Option<u32> {
+		let res = self.lines.binary_search_by(|(i, _)| i.cmp(&instr));
+		let n = match res {
+			Ok(n) => n,
+			Err(n) => n.saturating_sub(1),
+		};
+		self.lines.get(n).map(|(_, l)| *l)
+	}
+
 	pub fn add_const(&mut self, v: Value) -> usize {
 		assert!(
 			self.consts.len() < 0xff_ffff,
diff --git a/talc-lang/src/compiler.rs b/talc-lang/src/compiler.rs
index 1e83959..964117c 100644
--- a/talc-lang/src/compiler.rs
+++ b/talc-lang/src/compiler.rs
@@ -81,13 +81,18 @@ struct Compiler<'a> {
 
 pub fn compile(expr: &Expr, name: Option<Symbol>) -> Result<Function> {
 	let mut comp = Compiler::new_module(name, None);
+	comp.chunk.set_line(0);
 	comp.expr(expr)?;
 	Ok(comp.finish())
 }
 
 pub fn compile_repl(expr: &Expr, globals: &mut Vec<Symbol>) -> Result<Function> {
 	let mut comp = Compiler::new_repl(globals);
+	comp.chunk.set_line(0);
 	match &expr.kind {
+		ExprKind::Block(xs) if xs.is_empty() => {
+			comp.emit(I::Nil);
+		}
 		ExprKind::Block(xs) => {
 			for x in &xs[0..xs.len() - 1] {
 				comp.expr(x)?;
@@ -439,6 +444,7 @@ impl<'a> Compiler<'a> {
 
 	fn expr(&mut self, e: &Expr) -> Result<()> {
 		let Expr { kind, span } = e;
+		self.chunk.set_line(span.start.line);
 		match kind {
 			ExprKind::Block(xs) if xs.is_empty() => {
 				self.emit(I::Nil);
@@ -845,6 +851,7 @@ impl<'a> Compiler<'a> {
 	}
 
 	fn lvalue(&mut self, lv: &LValue) -> Result<()> {
+		self.chunk.set_line(lv.span.start.line);
 		match &lv.kind {
 			LValueKind::Ident(i) => {
 				self.emit(I::Dup);
diff --git a/talc-lang/src/exception.rs b/talc-lang/src/exception.rs
index 86e9c3d..0d00612 100644
--- a/talc-lang/src/exception.rs
+++ b/talc-lang/src/exception.rs
@@ -1,21 +1,59 @@
 use crate::{
 	lstring::LStr,
-	symbol::{Symbol, SYM_MSG, SYM_TYPE},
+	symbol::{Symbol, SYM_MSG, SYM_TRACE, SYM_TYPE},
 	value::Value,
 };
 use std::{fmt::Display, rc::Rc};
 
 pub type Result<T> = std::result::Result<T, Exception>;
 
+#[derive(Clone, Debug)]
+pub struct Trace {
+	line: Option<u32>,
+	scope: Option<Symbol>,
+}
+
+impl Trace {
+	pub fn from_value(value: &Value) -> Option<Self> {
+		let Value::List(lst) = value else { return None };
+		let lst = lst.borrow();
+		if lst.len() < 2 {
+			return None;
+		}
+		let line = match &lst[0] {
+			Value::Int(s) => Some(s.to_u32()?),
+			Value::Nil => None,
+			_ => return None,
+		};
+		let scope = match &lst[1] {
+			Value::Symbol(s) => Some(*s),
+			Value::Nil => None,
+			_ => return None,
+		};
+		Some(Self { line, scope })
+	}
+
+	pub fn to_value(&self) -> Value {
+		let line = self.line.map_or(Value::Nil, Value::from);
+		let scope = self.scope.map_or(Value::Nil, Value::from);
+		vec![line, scope].into()
+	}
+}
+
 #[derive(Clone, Debug)]
 pub struct Exception {
 	pub ty: Symbol,
 	pub msg: Rc<LStr>,
+	pub trace: Vec<Trace>,
 }
 
 impl Exception {
 	pub fn new(ty: Symbol, msg: Rc<LStr>) -> Self {
-		Self { ty, msg }
+		Self {
+			ty,
+			msg,
+			trace: Vec::new(),
+		}
 	}
 
 	pub fn from_value(value: &Value) -> Option<Self> {
@@ -25,27 +63,54 @@ impl Exception {
 		let table = table.borrow();
 		let ty = table.get(&(*SYM_TYPE).into())?;
 		let msg = table.get(&(*SYM_MSG).into())?;
-		if let (Value::Symbol(ty), Value::String(msg)) = (ty, msg) {
-			Some(Self {
-				ty: *ty,
-				msg: msg.clone(),
-			})
-		} else {
-			None
-		}
+		let (Value::Symbol(ty), Value::String(msg)) = (ty, msg) else {
+			return None
+		};
+		let trace_lst = table.get(&(*SYM_TRACE).into())?;
+		let Value::List(trace_lst) = trace_lst else {
+			return None
+		};
+		let trace = trace_lst
+			.borrow()
+			.iter()
+			.map(Trace::from_value)
+			.collect::<Option<_>>()?;
+		Some(Self {
+			ty: *ty,
+			msg: msg.clone(),
+			trace,
+		})
 	}
 
 	pub fn to_value(self) -> Value {
+		let trace: Vec<Value> = self.trace.iter().map(Trace::to_value).collect();
 		Value::new_table(|table| {
 			table.insert((*SYM_TYPE).into(), self.ty.into());
 			table.insert((*SYM_MSG).into(), Value::String(self.msg));
+			table.insert((*SYM_TRACE).into(), trace.into());
 		})
 	}
+
+	pub fn add_trace(&mut self, line: Option<u32>, scope: Option<Symbol>) {
+		self.trace.push(Trace { line, scope });
+	}
 }
 
 impl Display for Exception {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-		write!(f, "{}: {}", self.ty.name(), self.msg)
+		write!(f, "{}: {}", self.ty.name(), self.msg)?;
+		for trace in &self.trace {
+			write!(f, "\n    ")?;
+			if let Some(scope) = trace.scope {
+				write!(f, "in {}", scope.name())?;
+			} else {
+				write!(f, "in <anonymous>")?;
+			}
+			if let Some(line) = trace.line {
+				write!(f, " at {line}")?;
+			}
+		}
+		Ok(())
 	}
 }
 
@@ -73,4 +138,5 @@ macro_rules! throw {
 	};
 }
 
+use num::ToPrimitive;
 pub use throw;
diff --git a/talc-lang/src/lstring.rs b/talc-lang/src/lstring.rs
index 77e77fa..5223995 100644
--- a/talc-lang/src/lstring.rs
+++ b/talc-lang/src/lstring.rs
@@ -393,6 +393,13 @@ impl<'a> From<&'a str> for &'a LStr {
 	}
 }
 
+impl<'a> From<&'a String> for &'a LStr {
+	#[inline]
+	fn from(value: &'a String) -> Self {
+		Self::from(value.as_str())
+	}
+}
+
 impl<'a> From<&'a OsStr> for &'a LStr {
 	#[inline]
 	fn from(value: &'a OsStr) -> Self {
diff --git a/talc-lang/src/parser/lexer.rs b/talc-lang/src/parser/lexer.rs
index 092c483..571586c 100644
--- a/talc-lang/src/parser/lexer.rs
+++ b/talc-lang/src/parser/lexer.rs
@@ -212,11 +212,20 @@ pub struct Lexer<'s> {
 
 impl<'s> Lexer<'s> {
 	pub fn new(src: &'s str) -> Self {
+		Self::new_at(src, 1)
+	}
+
+	pub fn new_at(src: &'s str, line: u32) -> Self {
+		let pos = Pos {
+			line,
+			col: 0,
+			idx: 0,
+		};
 		Self {
 			src,
 			chars: src.chars().peekable(),
-			start_pos: Pos::new(),
-			pos: Pos::new(),
+			start_pos: pos,
+			pos,
 		}
 	}
 
diff --git a/talc-lang/src/parser/parser.rs b/talc-lang/src/parser/parser.rs
index fe2d501..14e9c96 100644
--- a/talc-lang/src/parser/parser.rs
+++ b/talc-lang/src/parser/parser.rs
@@ -229,6 +229,12 @@ impl<'s> Parser<'s> {
 		}
 	}
 
+	fn new_at(src: &'s str, line: u32) -> Self {
+		Self {
+			lexer: Lexer::new_at(src, line).peekable(),
+		}
+	}
+
 	fn next(&mut self) -> Result<Token<'s>> {
 		self.lexer.next().unwrap()
 	}
@@ -739,3 +745,7 @@ impl<'s> Parser<'s> {
 pub fn parse(src: &str) -> Result<Expr> {
 	Parser::new(src).parse()
 }
+
+pub fn parse_from(src: &str, line: u32) -> Result<Expr> {
+	Parser::new_at(src, line).parse()
+}
diff --git a/talc-lang/src/symbol.rs b/talc-lang/src/symbol.rs
index abb266b..bbffc87 100644
--- a/talc-lang/src/symbol.rs
+++ b/talc-lang/src/symbol.rs
@@ -32,6 +32,7 @@ lazy_static! {
 	pub static ref SYM_END_ITERATION: Symbol = symbol!(end_iteration);
 	pub static ref SYM_TYPE: Symbol = symbol!(type);
 	pub static ref SYM_MSG: Symbol = symbol!(msg);
+	pub static ref SYM_TRACE: Symbol = symbol!(trace);
 	pub static ref SYM_TYPE_ERROR: Symbol = symbol!(type_error);
 	pub static ref SYM_VALUE_ERROR: Symbol = symbol!(value_error);
 	pub static ref SYM_NAME_ERROR: Symbol = symbol!(name_error);
diff --git a/talc-lang/src/value/index.rs b/talc-lang/src/value/index.rs
index 3e605d1..233d36c 100644
--- a/talc-lang/src/value/index.rs
+++ b/talc-lang/src/value/index.rs
@@ -75,7 +75,7 @@ impl Value {
 						Some(i) => col.index(i),
 						None => Ok(Value::from(*SYM_END_ITERATION)),
 					};
-					Ok(NativeFunc::new(Box::new(func), 0, symbol!("index...")).into())
+					Ok(NativeFunc::new(Box::new(func), 0, symbol!("<index...>")).into())
 				} else {
 					throw!(*SYM_TYPE_ERROR, "cannot index {col:#} with {idx:#}")
 				}
diff --git a/talc-lang/src/value/mod.rs b/talc-lang/src/value/mod.rs
index 774cd82..3849040 100644
--- a/talc-lang/src/value/mod.rs
+++ b/talc-lang/src/value/mod.rs
@@ -448,9 +448,21 @@ macro_rules! impl_from {
 impl_from!(bool, Bool, hash);
 impl_from!(Symbol, Symbol, hash);
 impl_from!(Range, Range, rc);
+
 impl_from!(Int, Int, hash);
-impl_from!(i64, Int, into);
 impl_from!(BigInt, Int, into);
+impl_from!(i8, Int, into);
+impl_from!(i16, Int, into);
+impl_from!(i32, Int, into);
+impl_from!(i64, Int, into);
+impl_from!(isize, Int, into);
+impl_from!(u8, Int, into);
+impl_from!(u16, Int, into);
+impl_from!(u32, Int, into);
+impl_from!(u64, Int, into);
+impl_from!(usize, Int, into);
+
+impl_from!(f32, Float, into);
 impl_from!(f64, Float);
 impl_from!(Ratio, Ratio, rchash);
 impl_from!(Complex64, Complex);
diff --git a/talc-lang/src/value/ops.rs b/talc-lang/src/value/ops.rs
index b900986..16db777 100644
--- a/talc-lang/src/value/ops.rs
+++ b/talc-lang/src/value/ops.rs
@@ -546,7 +546,7 @@ impl Value {
 						range_iter.borrow_mut().next().map(Value::from),
 					))
 				};
-				Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[range]")).into())
+				Ok(NativeFunc::new(Box::new(f), 0, symbol!("<range iter>")).into())
 			}
 			Self::String(s) => {
 				let byte_pos = RefCell::new(0);
@@ -559,7 +559,7 @@ impl Value {
 						Ok(Value::from(*SYM_END_ITERATION))
 					}
 				};
-				Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[string]")).into())
+				Ok(NativeFunc::new(Box::new(f), 0, symbol!("<string iter>")).into())
 			}
 			Self::List(list) => {
 				let idx = RefCell::new(0);
@@ -572,7 +572,7 @@ impl Value {
 						Ok(Value::from(*SYM_END_ITERATION))
 					}
 				};
-				Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[list]")).into())
+				Ok(NativeFunc::new(Box::new(f), 0, symbol!("<list iter>")).into())
 			}
 			Self::Table(table) => {
 				let keys: Vec<HashValue> = table.borrow().keys().cloned().collect();
@@ -582,7 +582,7 @@ impl Value {
 						keys.borrow_mut().next().map(HashValue::into_inner),
 					))
 				};
-				Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[table]")).into())
+				Ok(NativeFunc::new(Box::new(f), 0, symbol!("<table iter>")).into())
 			}
 			_ => throw!(*SYM_TYPE_ERROR, "cannot iterate {self:#}"),
 		}
diff --git a/talc-lang/src/vm.rs b/talc-lang/src/vm.rs
index 2439b06..3580aed 100644
--- a/talc-lang/src/vm.rs
+++ b/talc-lang/src/vm.rs
@@ -16,7 +16,7 @@ use crate::{
 		SYM_VALUE_ERROR,
 	},
 	value::{
-		function::{FuncAttrs, Function, NativeFunc},
+		function::{Function, NativeFunc},
 		HashValue, Value,
 	},
 };
@@ -112,19 +112,20 @@ fn get_call_outcome(args: Vec<Value>) -> Result<CallOutcome> {
 		Ordering::Less => {
 			let remaining = attrs.arity - argc;
 			let f = f.clone();
+
+			let name = match attrs.name {
+				None => Symbol::get("<partial>"),
+				Some(s) => Symbol::get(&format!("<partial {}>", s.name())),
+			};
+
 			let nf = move |vm: &mut Vm, inner_args: Vec<Value>| {
 				let mut ia = inner_args.into_iter();
 				ia.next();
 				let args: Vec<Value> = args.clone().into_iter().chain(ia).collect();
 				vm.call_value(f.clone(), args)
 			};
-			let nf = NativeFunc {
-				attrs: FuncAttrs {
-					arity: remaining,
-					name: None,
-				},
-				func: Box::new(nf),
-			};
+
+			let nf = NativeFunc::new(Box::new(nf), remaining, name);
 			Ok(CallOutcome::Partial(nf.into()))
 		}
 	}
@@ -175,7 +176,10 @@ impl Vm {
 			CallOutcome::Partial(v) => Ok(v),
 			CallOutcome::Call(args) => match value {
 				Value::Function(f) => self.run_function(f, args),
-				Value::NativeFunc(f) => (f.func)(self, args),
+				Value::NativeFunc(f) => (f.func)(self, args).map_err(|mut e| {
+					e.add_trace(None, f.attrs.name);
+					e
+				}),
 				_ => unreachable!("already verified by calling get_call_type"),
 			},
 		}
@@ -198,8 +202,8 @@ impl Vm {
 					self.stack.truncate(init_stack_len);
 					return Ok(v)
 				}
-				Err(e) => {
-					if let Err(e) = self.handle_exception(&mut frame, e) {
+				Err(exc) => {
+					if let Err(e) = self.handle_exception(&mut frame, exc) {
 						self.stack.truncate(init_stack_len);
 						return Err(e)
 					}
@@ -208,8 +212,14 @@ impl Vm {
 		}
 	}
 
-	fn handle_exception(&mut self, frame: &mut CallFrame, exc: Exception) -> Result<()> {
+	fn handle_exception(
+		&mut self,
+		frame: &mut CallFrame,
+		mut exc: Exception,
+	) -> Result<()> {
 		loop {
+			let line = frame.func.chunk.get_line(frame.ip as u32);
+			exc.add_trace(line, frame.func.attrs.name);
 			while let Some(try_frame) = frame.try_frames.pop() {
 				let table = &frame.func.chunk.try_tables[try_frame.idx];
 				for catch in &table.catches {
diff --git a/talc-std/src/collection.rs b/talc-std/src/collection.rs
index 82f957d..64c1fd8 100644
--- a/talc-std/src/collection.rs
+++ b/talc-std/src/collection.rs
@@ -223,7 +223,7 @@ pub fn sort_key(vm: &mut Vm, args: Vec<Value>) -> Result<Value> {
 			),
 		}
 	};
-	let nf = NativeFunc::new(Box::new(f), 2, symbol!("inner[sort_key]")).into();
+	let nf = NativeFunc::new(Box::new(f), 2, symbol!("<sort_key inner>")).into();
 	sort_inner(&mut list.borrow_mut(), Some(&nf), vm)?;
 	Ok(list.into())
 }
diff --git a/talc-std/src/file.rs b/talc-std/src/file.rs
index 27f87ab..a3342ef 100644
--- a/talc-std/src/file.rs
+++ b/talc-std/src/file.rs
@@ -509,7 +509,7 @@ fn tcp_listen_inner(listener: TcpListener) -> Value {
 		},
 		Err(e) => throw!(*SYM_IO_ERROR, "{e}"),
 	};
-	NativeFunc::new(Box::new(func), 0, symbol!("inner[tcp_listen]")).into()
+	NativeFunc::new(Box::new(func), 0, symbol!("<tcp_listen inner>")).into()
 }
 
 #[native_func(1)]
diff --git a/talc-std/src/iter.rs b/talc-std/src/iter.rs
index bc4dc09..59617f2 100644
--- a/talc-std/src/iter.rs
+++ b/talc-std/src/iter.rs
@@ -95,7 +95,7 @@ pub fn pairs(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 			Ok(Value::iter_pack(None))
 		}
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[pairs]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<pairs iterator>")).into())
 }
 
 #[native_func(1)]
@@ -104,7 +104,7 @@ pub fn once(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 
 	let v = RefCell::new(Some(val));
 	let f = move |_: &mut Vm, _| Ok(Value::iter_pack(v.borrow_mut().take()));
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[once]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<once iterator>")).into())
 }
 
 #[native_func(1)]
@@ -112,7 +112,7 @@ pub fn forever(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 	let [_, val] = unpack_args!(args);
 
 	let f = move |_: &mut Vm, _| Ok(val.clone());
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[forever]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<forever iterator>")).into())
 }
 
 //
@@ -128,7 +128,7 @@ pub fn map(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		Some(val) => Ok(vmcall!(vm; map.clone(), val)?),
 		None => Ok(Value::iter_pack(None)),
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[map]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<map iterator>")).into())
 }
 
 #[native_func(2)]
@@ -143,7 +143,7 @@ pub fn tee(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 		None => Ok(Value::iter_pack(None)),
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[tee]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<tee iterator>")).into())
 }
 
 #[native_func(3)]
@@ -161,7 +161,7 @@ pub fn scan(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		*result.borrow_mut() = r.clone();
 		Ok(r)
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[scan]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<scan iterator>")).into())
 }
 
 #[native_func(2)]
@@ -178,7 +178,7 @@ pub fn filter(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 			return Ok(next)
 		}
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[filter]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<filter iterator>")).into())
 }
 
 #[native_func(2)]
@@ -207,7 +207,7 @@ pub fn take(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		*taken.borrow_mut() += 1;
 		Ok(next)
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[take]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<take iterator>")).into())
 }
 
 #[native_func(2)]
@@ -235,7 +235,7 @@ pub fn skip(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 		vmcall!(vm; iter.clone())
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[skip]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<skip iterator>")).into())
 }
 
 #[native_func(1)]
@@ -254,7 +254,7 @@ pub fn enumerate(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		Ok(Value::from(vec![n.into(), next]))
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[enumerate]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<enumerate iterator>")).into())
 }
 
 #[native_func(1)]
@@ -288,7 +288,7 @@ pub fn cycle(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[cycle]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<cycle iterator>")).into())
 }
 
 #[derive(Clone, Copy, Default)]
@@ -336,7 +336,7 @@ pub fn step(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 		Step::End => Ok(Value::Nil),
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[step]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<step iterator>")).into())
 }
 
 #[native_func(1)]
@@ -355,7 +355,7 @@ pub fn rev(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 		Ok(Value::iter_pack(lst.borrow_mut().as_mut().unwrap().pop()))
 	};
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[rev]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<rev iterator>")).into())
 }
 
 //
@@ -381,7 +381,7 @@ pub fn zip(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		Ok(Value::from(res))
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[zip]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<zip iterator>")).into())
 }
 
 #[native_func(1)]
@@ -407,7 +407,7 @@ pub fn zipn(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		Ok(Value::from(res))
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[zipn]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<zipn iterator>")).into())
 }
 
 #[native_func(2)]
@@ -434,7 +434,7 @@ pub fn alternate(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[alternate]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<alternate iterator>")).into())
 }
 
 #[native_func(1)]
@@ -466,7 +466,7 @@ pub fn alternaten(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[alternaten]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<alternaten iterator>")).into())
 }
 
 #[derive(Default)]
@@ -510,7 +510,7 @@ pub fn intersperse(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		Intersperse::End => Ok(Value::iter_pack(None)),
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[intersperse]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<intersperse iterator>")).into())
 }
 
 #[native_func(2)]
@@ -532,7 +532,7 @@ pub fn chain(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		}
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[chain]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<chain iterator>")).into())
 }
 
 #[derive(Default, Debug)]
@@ -597,7 +597,7 @@ pub fn cartprod(_: &mut Vm, args: Vec<Value>) -> Result<Value> {
 		Ok(Value::from(vec![a_res, b_res]))
 	};
 
-	Ok(NativeFunc::new(Box::new(f), 0, symbol!("iter[cart_prod]")).into())
+	Ok(NativeFunc::new(Box::new(f), 0, symbol!("<cart_prod iterator>")).into())
 }
 
 //