Method parse_set_expression

crates/ruff_python_parser/src/parser/expression.rs:2506–2552

Parses a set expression. See:

(&mut self, first_element: ParsedExpr, start: TextSize)

    ///
    /// See: <https://docs.python.org/3/reference/expressions.html#set-displays>
    fn parse_set_expression(&mut self, first_element: ParsedExpr, start: TextSize) -> ast::ExprSet {
        if !self.at_sequence_end() {
            self.expect(TokenKind::Comma);
        }

        // test_err unparenthesized_named_expr_set_literal_py38
        // # parse_options: {"target-version": "3.8"}
        // {x := 1, 2, 3}
        // {1, x := 2, 3}
        // {1, 2, x := 3}

        if first_element.is_unparenthesized_named_expr() {
            self.add_unsupported_syntax_error(
                UnsupportedSyntaxErrorKind::UnparenthesizedNamedExpr(
                    UnparenthesizedNamedExprKind::SetLiteral,
                ),
                first_element.range(),
            );
        }

        let elts_snapshot = self.expr_scratch.snapshot();
        self.expr_scratch.push(first_element.expr);

        self.parse_comma_separated_list(RecoveryContextKind::SetElements, |parser| {
            let parsed_expr =
                parser.parse_named_expression_or_higher(ExpressionContext::starred_bitwise_or());

            if parsed_expr.is_unparenthesized_named_expr() {
                parser.add_unsupported_syntax_error(
                    UnsupportedSyntaxErrorKind::UnparenthesizedNamedExpr(
                        UnparenthesizedNamedExprKind::SetLiteral,
                    ),
                    parsed_expr.range(),
                );
            }

            parser.expr_scratch.push(parsed_expr.expr);
        });

        self.expect(TokenKind::Rbrace);

        ast::ExprSet {
            range: self.node_range(start),
            node_index: AtomicNodeIndex::NONE,
            elts: self.expr_scratch.take(elts_snapshot),
        }
    }

    /// Parses a dictionary expression.
    ///