diff --git a/src/parser.rs b/src/parser.rs
index f7390e3..7f4a722 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -9,6 +9,7 @@
 
 mod basic;
 mod expr;
+mod func_defs;
 mod lit;
 mod prefix;
 mod suffix;
diff --git a/src/parser/basic.rs b/src/parser/basic.rs
index 570cc83..f5e732b 100644
--- a/src/parser/basic.rs
+++ b/src/parser/basic.rs
@@ -46,7 +46,7 @@ pub fn ident() -> BoxedParser<'static, char, Ident, Error> {
         .try_map(|name, span| {
             if matches!(
                 &name as &str,
-                "nil" | "true" | "false" | "local" | "not" | "and" | "or"
+                "nil" | "true" | "false" | "local" | "function" | "not" | "and" | "or"
             ) {
                 Err(Simple::custom(span, "identifier uses reserved name"))
             } else {
diff --git a/src/parser/expr.rs b/src/parser/expr.rs
index b129aa0..c307086 100644
--- a/src/parser/expr.rs
+++ b/src/parser/expr.rs
@@ -6,6 +6,7 @@ use crate::ast::{BinOp, Expr};
 use crate::span::HasSpan;
 
 use super::basic::{space, Error};
+use super::func_defs::func_def;
 use super::lit::lit;
 use super::prefix::prefixed;
 use super::suffix::suffixed;
@@ -36,9 +37,16 @@ fn atom(
     let var = var(expr.clone()).map(Expr::Var);
     let table_constr = table_constr(expr.clone()).map(Expr::TableConstr);
     let table_destr = table_destr(expr.clone()).map(Expr::TableDestr);
+    let func_def = func_def(expr.clone()).map(Expr::FuncDef);
     let paren = atom_paren(expr.clone());
 
-    let base = lit.or(paren).or(table_destr).or(table_constr).or(var);
+    let base = lit
+        .or(paren)
+        .or(table_destr)
+        .or(table_constr)
+        .or(func_def)
+        .or(var);
+
     prefixed(suffixed(base, expr))
 }
 
diff --git a/src/parser/func_defs.rs b/src/parser/func_defs.rs
new file mode 100644
index 0000000..af6b0f7
--- /dev/null
+++ b/src/parser/func_defs.rs
@@ -0,0 +1,11 @@
+use chumsky::prelude::*;
+
+use crate::ast::{Expr, FuncDef};
+
+use super::basic::Error;
+
+pub fn func_def(
+    expr: impl Parser<char, Expr, Error = Error>,
+) -> BoxedParser<'static, char, FuncDef, Error> {
+    todo().boxed()
+}