Mutable ref

parser/src/ast.rs

@@ -14,6 +14,7 @@ pub struct Block(pub Vec<Statement>);
 #[derive(Debug, Clone, Serialize)]
 pub enum TypePostfix {
     Ref,
+    RefMut,
 }
 
 #[derive(Debug, Clone, Serialize)]

parser/src/grammar.pest

@@ -75,7 +75,7 @@ while_stmt = {
 // ================= EXPRESSIONS =================
 tuple_type = { "(" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ")" }
 path_type  = { static_path ~ ("<" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ">")? }
-ref_type   = { "*" }
+ref_type   = { mutable? ~ "*" }
 type_expr  = { (path_type | tuple_type) ~ ref_type* }
 
 primary = {

parser/src/lib.rs

@@ -44,9 +44,13 @@ impl From<pest::iterators::Pair<'_, Rule>> for TypeExpr {
 impl From<pest::iterators::Pair<'_, Rule>> for TypePostfix {
     fn from(pair: pest::iterators::Pair<'_, Rule>) -> Self {
         match pair.as_rule() {
-            Rule::ref_type => match pair.as_str().trim() {
-                _ => Self::Ref,
-            },
+            Rule::ref_type => {
+                if pair.into_inner().peek().is_some() {
+                    TypePostfix::RefMut
+                } else {
+                    TypePostfix::Ref
+                }
+            }
             _ => unimplemented!("{pair:#?}"),
         }
     }