Remove the paren expression

Signed-off-by: CHatingPython <chatingpython@gmail.com>

furc/src/ast.cpp

@@ -82,15 +82,6 @@ bool binop_expression_node::equal(const node& rhsNode) const {
     return expression_node::equal(rhsNode) && m_type == rhs.m_type && m_lhs == rhs.m_lhs && m_rhs == rhs.m_rhs;
 }
 
-std::ostream& paren_expression_node::print(std::ostream& os) const {
-    return os << *m_node;
-}
-
-bool paren_expression_node::equal(const node& rhsNode) const {
-    const auto& rhs = reinterpret_cast<const paren_expression_node&>(rhsNode);
-    return expression_node::equal(rhsNode) && m_node == rhs.m_node;
-}
-
 bool declaration_node::equal(const node& rhs) const {
     return declaration_type() == reinterpret_cast<const declaration_node&>(rhs).declaration_type();
 }

furc/src/front/parser.cpp

@@ -151,7 +151,7 @@ ast::expression_node_h parser::parse_expression_primary() {
         auto node = parse_expression();
         auto err  = eat_token(token_t::Rparen);
         if (err.has_error()) return err;
-        return ast::paren_expression_node_h{ tok.location(), m_arena, std::move(node) };
+        return node;
     }
     default: {
         auto literal = parse_literal();