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dnl Redefine m4wrap to have FIFO semantics.
define(`_m4wrap_level', `0')dnl
define(`m4wrap',
`ifdef(`m4wrap'_m4wrap_level,
       `define(`m4wrap'_m4wrap_level,
               defn(`m4wrap'_m4wrap_level)`$1')',
       `builtin(`m4wrap', `define(`_m4wrap_level',
                                  incr(_m4wrap_level))dnl
m4wrap'_m4wrap_level)dnl
define(`m4wrap'_m4wrap_level, `$1')')')dnl