symbol

pub fn symbol(tag: Tag) []const u8 {
    return tag.lexeme() orelse switch (tag) {
        .invalid => "invalid token",
        .identifier => "an identifier",
        .string_literal, .multiline_string_literal_line => "a string literal",
        .char_literal => "a character literal",
        .eof => "EOF",
        .builtin => "a builtin function",
        .number_literal => "a number literal",
        .doc_comment, .container_doc_comment => "a document comment",
        else => unreachable,
    };
}