renderWhile

fn renderWhile(r: *Render, while_node: Ast.full.While, space: Space) Error!void {
    const tree = r.tree;

    if (while_node.label_token) |label| {
        try renderIdentifier(r, label, .none, .eagerly_unquote); // label
        try renderToken(r, label + 1, .space); // :
    }

    if (while_node.inline_token) |inline_token| {
        try renderToken(r, inline_token, .space); // inline
    }

    try renderToken(r, while_node.ast.while_token, .space); // if/for/while
    try renderToken(r, while_node.ast.while_token + 1, .none); // lparen
    try renderExpression(r, while_node.ast.cond_expr, .none); // condition

    var last_prefix_token = tree.lastToken(while_node.ast.cond_expr) + 1; // rparen

    if (while_node.payload_token) |payload_token| {
        try renderToken(r, last_prefix_token, .space);
        try renderToken(r, payload_token - 1, .none); // |
        const ident = blk: {
            if (tree.tokenTag(payload_token) == .asterisk) {
                try renderToken(r, payload_token, .none); // *
                break :blk payload_token + 1;
            } else {
                break :blk payload_token;
            }
        };
        try renderIdentifier(r, ident, .none, .preserve_when_shadowing); // identifier
        const pipe = blk: {
            if (tree.tokenTag(ident + 1) == .comma) {
                try renderToken(r, ident + 1, .space); // ,
                try renderIdentifier(r, ident + 2, .none, .preserve_when_shadowing); // index
                break :blk ident + 3;
            } else {
                break :blk ident + 1;
            }
        };
        last_prefix_token = pipe;
    }

    if (while_node.ast.cont_expr.unwrap()) |cont_expr| {
        try renderToken(r, last_prefix_token, .space);
        const lparen = tree.firstToken(cont_expr) - 1;
        try renderToken(r, lparen - 1, .space); // :
        try renderToken(r, lparen, .none); // lparen
        try renderExpression(r, cont_expr, .none);
        last_prefix_token = tree.lastToken(cont_expr) + 1; // rparen
    }

    try renderThenElse(
        r,
        last_prefix_token,
        while_node.ast.then_expr,
        while_node.else_token,
        while_node.error_token,
        while_node.ast.else_expr,
        space,
    );
}