Added expr? syntax

parser/src/ast/expr.rs

@@ -71,6 +71,7 @@ pub enum Postfix {
     StructCall(Vec<(Identifier, Expression)>),
     Index(Expression),
     As(TypeExpr),
+    Try,
 }
 
 #[derive(Debug, Clone, Serialize)]

parser/src/grammar.pest

@@ -500,6 +500,10 @@ as_px = {
     "as" ~ type_expr
 }
 
+try_px = {
+    "?"
+}
+
 postfix = {
     field_px
   | call_px
@@ -507,6 +511,7 @@ postfix = {
   | struct_px
   | index_px
   | as_px
+  | try_px
 }
 
 // ------------------------------------------------------

parser/src/parser/common/expr.rs

@@ -183,6 +183,8 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Postfix {
                 ast_expr!(Postfix::As(inner.next().unwrap().try_into()))
             }
 
+            Rule::try_px => Ok(Postfix::Try),
+
             _ => AstError::bug_unimplemented(pair),
         }
     }