Optional constructor

crates/parser/src/ast/top_level.rs

@@ -56,7 +56,7 @@ pub enum TopLevelKind {
         generics: GenericsDecl,
         inherits: Option<ExprPath>,
         fields: Vec<Spanned<FieldDeclStmt>>,
-        constructor: Spanned<ClassConstructor>,
+        constructor: Option<Spanned<ClassConstructor>>,
         items: Vec<ClassItem>,
     },
 }

crates/parser/src/grammar.pest

@@ -292,7 +292,7 @@ class_item = _{
 }
 
 class_decl = {
-    visibility? ~ "class" ~ identifier ~ generics_decl? ~ (":" ~ expr_path)? ~ "{" ~ class_fields ~ class_constructor ~ class_item* ~ "}"
+    visibility? ~ "class" ~ identifier ~ generics_decl? ~ (":" ~ expr_path)? ~ "{" ~ class_fields ~ class_constructor? ~ class_item* ~ "}"
 }
 
 // ======================================================

crates/parser/src/parser/items/mod.rs

@@ -75,7 +75,9 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TopLevelKind {
 
                 fields: collect_recovered(inner.next().unwrap().into_inner()),
 
-                constructor: inner.next().unwrap().try_into(),
+                constructor: consume_rule(&mut inner, Rule::class_constructor)
+                    .map(Spanned::try_from)
+                    .transpose(),
 
                 items: collect_recovered(inner),
             }),