# Constant rustc_expand::mbe::quoted::VALID_FRAGMENT_NAMES_MSG_2021

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    const VALID_FRAGMENT_NAMES_MSG_2021: &str = "valid fragment specifiers are \
                                                 `ident`, `block`, `stmt`, `expr`, `expr_2021`, `pat`, \
                                                 `ty`, `lifetime`, `literal`, `path`, `meta`, `tt`, \
                                                 `item` and `vis`";