-dtreecheck bug

This issue has evolved from #2259 (closed) and #2261 (closed) which now both work without treecheck but fail through treecheck in phase 21:

** 21: Generating Code ...
  **** Tag preparation ...
           -> Running syntax tree checks
  **** Creating intermediate code macros ...
           -> Running syntax tree checks
warning: mandatory attribute ID_AVIS is NULL
...
warning: mandatory attribute ID_AVIS is NULL


OOOOOOOPS, your program crashed the compiler 8-((

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