letrec is no more a keyword; edit test

Author: DavidLee18

src/lang/parser.rs

@@ -62,7 +62,7 @@ fn sat<F: Fn(String) -> bool + 'static>(f: F) -> Parser<String> {
     })
 }
 
-const KEYWORDS: [&'static str; 6] = ["let", "letrec", "case", "in", "of", "Pack"];
+const KEYWORDS: [&'static str; 5] = ["let", "case", "in", "of", "Pack"];
 
 fn num() -> Parser<u32> {
     apply(

src/test.rs

@@ -125,7 +125,7 @@ fn nested_let() {
 #[test]
 fn letrec() {
     let res = compiler::eval(compiler::compile(lang::parse_raw(String::from(
-        "pair x y f = f x y; fst p = p K; snd p = p K1; f x y = letrec a = pair x b; b = pair y a in fst (snd (snd (snd a))); main = f 3 4",
+        "pair x y f = f x y; fst p = p K; snd p = p K1; f x y = let a = pair x b; b = pair y a in fst (snd (snd (snd a))); main = f 3 4",
     ))));
     let res_stack = compiler::get_stack_results(res.last().expect("Empty states"));
     assert_eq!(res_stack, vec![compiler::Node::Num(4)])