feat: support pure virtual destructors

grammar.js

@@ -497,6 +497,7 @@ module.exports = grammar(C, {
         field('body', choice($.compound_statement, $.try_statement)),
         $.default_method_clause,
         $.delete_method_clause,
+        $.pure_virtual_clause,
       ),
     ),
 
@@ -542,6 +543,7 @@ module.exports = grammar(C, {
         alias($.constructor_try_statement, $.try_statement),
         $.default_method_clause,
         $.delete_method_clause,
+        $.pure_virtual_clause,
       ),
     ),
 
@@ -553,6 +555,7 @@ module.exports = grammar(C, {
 
     default_method_clause: _ => seq('=', 'default', ';'),
     delete_method_clause: _ => seq('=', 'delete', ';'),
+    pure_virtual_clause: _ => seq('=', '0', ';'),
 
     friend_declaration: $ => seq(
       'friend',
@@ -1170,7 +1173,7 @@ module.exports = grammar(C, {
       ];
 
       return choice(
-        ...original.members,
+        original,
         ...table.map(([operator, precedence]) => {
           return prec.left(precedence, seq(
             field('left', $._expression),

test/corpus/definitions.txt

@@ -179,7 +179,7 @@ class C {
               (identifier))))))))
 
 ================================================================================
-Default and deleted methods
+Default, delete, and pure virtual methods
 ================================================================================
 
 class A : public B {
@@ -188,6 +188,7 @@ class A : public B {
   void f() = delete;
   A& operator=(const A&) = default;
   A& operator=(A&&) = delete;
+  ~A() = 0;
 };
 
 --------------------------------------------------------------------------------
@@ -238,7 +239,13 @@ class A : public B {
               (parameter_declaration
                 (type_identifier)
                 (abstract_reference_declarator)))))
-        (delete_method_clause)))))
+        (delete_method_clause))
+      (function_definition
+        (function_declarator
+          (destructor_name
+            (identifier))
+          (parameter_list))
+        (pure_virtual_clause)))))
 
 ================================================================================
 Destructor definitions