changed the way that functions are defined

tests/call_syntax_parens.sl

@@ -2,14 +2,14 @@ import ../stdlib/stdlib.sl
 import ../stdlib/io.sl
 import ../fn.sl
 
-: main
+word main
     2 40 +
     puti cr
     extend-syntax
     foo(1, 2)
     puti cr
     0
-;
+end
 
 fn foo(int a, int b){
     return a + b;