`top` might point to invalid memory after a call to self.stack.append which causes a segfault. Prevent this by recomputing `top`. Fixes #7560
Vincent Rischmann committed on 12/28/2020, 5:14:27 PMparent399c428
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`top` might point to invalid memory after a call to self.stack.append which causes a segfault. Prevent this by recomputing `top`. Fixes #7560