Akim Demaille 636c9a8042 glr2.cc: beware of self-assignment ...

In yycompressStack:

    while (yyr != YY_NULLPTR)
      {
        nextFreeItem->check_ ();
        yyr->check_();
        nextFreeItem->setState(*yyr);
        glr_state& nextFreeState = nextFreeItem->getState();
        yyr = yyr->pred();
        nextFreeState.setPred(&(nextFreeItem - 1)->getState());
        setFirstTop(&nextFreeState);
        ++nextFreeItem;
      }

it is possible that nextFreeItem and yyr are actually the same state.
In which case `nextFreeItem->setState(*yyr)` does really bad things.

* data/skeletons/glr2.cc (glr_stack_item::setState): Beware of
self-assignment.

2020-12-25 11:04:53 +01:00

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