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  1. or download this
    # while:
    while $cond { $statements }
    ...
    my_while $cond, █
    # not allowed in builtin while:
    while $cond █
    
  2. or download this
    rule statement_control:while {\
        <sym>
    ...
        <pblock>                           {*}                      #= blo
    +ck
        {*}
    }