add <3 macro

lib/kokoro.klambda

@@ -6,4 +6,5 @@
 		"builtins" "input" ("")))
 (defun thesis
 	(spit
-		("this language belongs to makise kurisu. there are many like it, but this one is hers.")))
+		("this language belongs to makise kurisu. there are many like it, but this one is hers.")))
+DEFINE:<3:(thesis)

main.py

@@ -32,6 +32,7 @@ def expand(file, path):
             args, exp = defs[parts[0]]
 
             for arg_idx, arg in enumerate(parts[1:]):
+                if len(args) < 1: break
                 exp = exp.replace(
                     args[arg_idx], arg
                 )