[Bug c/69796] [6 Regression] ICE on invalid code in useless_type_conversion_p, at gimple-expr.c:83

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69796

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|bernds at gcc dot gnu.org          |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 37804
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37804&action=edit
gcc6-pr69796-1.patch

As the other PRs clearly show, the middle-end is simply unprepared to have
error_mark_node type on the VAR_DECLs appearing so late in the IL.
So, IMHO we have two options, either set TREE_TYPE to some random other valid
type, as this patch...