diff --git a/fmt/src/gen/mod.rs b/fmt/src/gen/mod.rs
index 05f8760..44b276f 100644
--- a/fmt/src/gen/mod.rs
+++ b/fmt/src/gen/mod.rs
@@ -1,7 +1,7 @@
 use std::borrow::BorrowMut;
 
 use dprint_core::formatting::PrintItems;
-use whistle_ast::{IdentType, IdentTyped, ProgramStmt, Stmt};
+use whistle_ast::*;
 
 use crate::{config::Configuration, ParsedSource};
 
@@ -22,9 +22,9 @@ pub fn generate(parsed_source: &ParsedSource, _config: &Configuration) -> PrintI
         items.borrow_mut(),
         export,
         inline,
-        ident,
-        params,
-        ret_type,
+        ident.clone(),
+        params.to_vec(),
+        &mut ret_type.clone(),
         stmt,
       ),
       _ => panic!("Unimplemented"),
@@ -34,12 +34,52 @@ pub fn generate(parsed_source: &ParsedSource, _config: &Configuration) -> PrintI
 }
 
 pub fn gen_fn(
-  _items: &mut PrintItems,
-  _export: &bool,
+  items: &mut PrintItems,
+  export: &bool,
   _inline: &bool,
-  _ident: &str,
-  _params: &Vec<IdentTyped>,
-  _ret_type: &IdentType,
-  _stmts: &Vec<Stmt>,
+  ident: String,
+  params: Vec<IdentTyped>,
+  ret_type: &mut IdentType,
+  stmts: &Vec<Stmt>,
 ) {
+  if *export {
+    items.push_str("export ");
+  }
+  items.push_str("fn ");
+  items.push_string(ident);
+  items.push_str("(");
+  for (i, param) in params.iter().enumerate() {
+    if i > 0 {
+      items.push_str(", ");
+    }
+    items.push_string(param.ident.clone());
+    items.push_str(": ");
+    match param.type_ident.to_type() {
+      Type::Ident(ident) => {
+        items.push_string(ident);
+      }
+      _ => panic!("Unimplemented"),
+    }
+  }
+  items.push_str(")");
+  items.push_str(": ");
+  match ret_type.borrow_mut().to_type() {
+    Type::Ident(ident) => {
+      items.push_string(ident);
+    }
+    _ => panic!("Unimplemented"),
+  }
+  // items.push_str(&ret_type.to_type().type_id());
+
+  items.push_str(" {\n");
+  for stmt in stmts {
+    gen_stmt(items, stmt);
+  }
+  items.push_str("}\n");
+}
+
+pub fn gen_stmt(_items: &mut PrintItems, stmt: &Stmt) {
+  match stmt {
+    _ => panic!("Unimplemented"),
+  }
 }