expand_explain_doc_comment_outer =
    outer doc comments expand to `#[doc = "..."]`, which is what this macro attempted to match

expand_explain_doc_comment_inner =
    inner doc comments expand to `#![doc = "..."]`, which is what this macro attempted to match

expand_expr_repeat_no_syntax_vars =
    attempted to repeat an expression containing no syntax variables matched as repeating at this depth

expand_must_repeat_once =
    this must repeat at least once

expand_count_repetition_misplaced =
    `count` can not be placed inside the inner-most repetition

expand_meta_var_expr_unrecognized_var =
    variable `{$key}` is not recognized in meta-variable expression

expand_var_still_repeating =
    variable '{$ident}' is still repeating at this depth

expand_meta_var_dif_seq_matchers = {$msg}