diff --git a/lib.nix b/lib.nix
index 9383803..46f4c6e 100644
--- a/lib.nix
+++ b/lib.nix
@@ -16,7 +16,7 @@
  */
 let
   inherit (builtins) isString isFloat isInt isBool isList isAttrs isNull isPath;
-  inherit (builtins) concatStringsSep filter mapAttrs attrValues;
+  inherit (builtins) concatStringsSep filter mapAttrs attrValues concatLists;
 
   isNotNull = v: !(isNull v);
   excludeNull = expr: filter isNotNull expr;
@@ -126,30 +126,28 @@ let
 
   local = expr: spaceBetween [ kw_local expr ];
   set = variable: value: join " = " [ (raw variable) value ];
+
+  funcParams' = params: wrapParen (join ", " (map raw params));
+
   func = fnName: params: body:
-    (spaceBetween
-      ([
+    (spaceBetween (concatLists [
+      [
         (concat [
           (spaceBetween [ kw_function (validFuncName fnName) ])
-          (wrapParen (join ", " (map raw params)))
+          (funcParams' params)
         ])
       ]
-      ++ (validBlockBody body)
-      ++ [ kw_end ])
-    );
+      (validBlockBody body)
+      [ kw_end ]
+    ]));
   func0 = fnName: func fnName [ ];
 
   lambda = params: body:
-    (spaceBetween
-      ([
-        (concat [
-          kw_function
-          (wrapParen (join ", " (map raw params)))
-        ])
-      ]
-      ++ (validBlockBody body)
-      ++ [ kw_end ])
-    );
+    (spaceBetween (concatLists [
+      [ (concat [ kw_function (funcParams' params) ]) ]
+      (validBlockBody body)
+      [ kw_end ]
+    ]));
   lambda0 = lambda [ ];
 
   return = expr: spaceBetween ([ kw_return expr ]);
@@ -157,12 +155,12 @@ let
     null;
 
   ifelse = condition: trueBody: falseBody:
-    (spaceBetween
-      ([ kw_if condition kw_then ]
-        ++ (validBlockBody trueBody)
-        ++ (if falseBody != [ ] then [ kw_else ] ++ (validBlockBody falseBody) else [ ])
-        ++ [ kw_end ])
-    );
+    (spaceBetween (concatLists [
+      [ kw_if condition kw_then ]
+      (validBlockBody trueBody)
+      (if falseBody != [ ] then [ kw_else ] ++ (validBlockBody falseBody) else [ ])
+      [ kw_end ]
+    ]));
   if' = condition: trueBody: ifelse condition trueBody [ ];
 
   isLuaNil = expr: getType expr == "nil";
diff --git a/lib.test.nix b/lib.test.nix
index 69e9832..3543aca 100644
--- a/lib.test.nix
+++ b/lib.test.nix
@@ -174,7 +174,7 @@ with nix2lua; pkgs.lib.runTests {
     expected = "function hello(a) h.world(a) end";
   };
   "test returns defined lambda" = {
-    expr = toLua (lambda [ "a" ] (call1 "h.world" (var "a")));
+    expr = toLua (lambda [ "a" ] (call "h.world" (var "a")));
     expected = "function(a) h.world(a) end";
   };
   "test returns if statement" = {