[Bug tree-optimization/115143] [11/12/13/14/15 Regression] tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.cc:85

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115143

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note this is a latent bug that dates back to r0-66475-g8eaa0f34a3387d (GCC
4.1.0)

Note also r13-1950-g9bb19e143cfe88 introduced the similar bug too.

Basically there needs a check for no phi nodes in the middle bb's.