Default argument to function

schala-lang/language/src/parsing.rs

@@ -472,6 +472,10 @@ impl Parser {
       _ => None
     };
     let default = match self.token_handler.peek_kind() {
+      Equals => {
+        self.token_handler.next();
+        Some(self.expression()?)
+      },
       _ => None
     };
     Ok(FormalParam { name, anno, default })

schala-lang/language/src/parsing/test.rs

@@ -225,6 +225,21 @@ x()
       vec![exst!(s "x()")])))]));
 }
 
+#[test]
+fn functions_with_default_args() {
+  parse_test! {
+    "fn func(x: Int, y: Int = 4) { }",
+    AST(vec![
+      Meta::new(Declaration(
+        FuncDecl(Signature { name: rc!(func), operator: false, type_anno: None, params: vec![
+          FormalParam { name: rc!(x), default: None, anno: Some(ty!("Int")) },
+          FormalParam { name: rc!(y), default: Some(ex!(s "4")), anno: Some(ty!("Int")) }
+        ]}, vec![])
+      ))
+    ])
+  };
+}
+
 #[test]
 fn parsing_bools() {
   parse_test!("false", AST(vec![exst!(BoolLiteral(false))]));