Update: Self param #64

crates/parser/src/grammar.pest

@@ -278,7 +278,7 @@ class_field = {
 }
 
 self_param = {
-    "self" ~ mutable? ~ deref_px?
+    (deref_px ~ lifetime?)? ~ mutable? ~ "self"
 }
 
 method_args = _{

crates/parser/src/parser/items/function.rs

@@ -22,15 +22,23 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FunctionDecl {
 
             let self_param = consume_rule(&mut inner, Rule::self_param).map(|param| {
                 let mut param_inner = param.into_inner();
-                let mutable = listen_rule(&mut param_inner, Rule::mutable);
                 let is_ref = listen_rule(&mut param_inner, Rule::deref_px);
+                let lifetime = consume_rule(&mut param_inner, Rule::lifetime);
+                let mutable = listen_rule(&mut param_inner, Rule::mutable);
                 let name = Pattern::Path(mutable && !is_ref, Path(vec![Identifier(String::from("self"))]));
                 let self_ty = TypeExpr::Path(Path(vec![Identifier(String::from("Self"))]), None);
 
                 VarDecl {
                     name: name.clone(),
                     type_: Some(if is_ref {
-                        TypeExpr::Ref { lifetime: None, mutable, ty: Box::new(self_ty) }
+                        TypeExpr::Ref {
+                            lifetime:
+                                lifetime.map(|v| Identifier::try_from(v.into_inner().next().unwrap()))
+                                    .transpose()
+                                    .expect("Failed to get lifetime identifier"),
+                            mutable,
+                            ty: Box::new(self_ty)
+                        }
                     } else {
                         self_ty
                     }),