[Bug rust/107633] [13 regression] Bootstrap failure due to -Werror=unused-parameter and -Werror=dangling-reference

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107633

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Actually, the patch I plan to post in a little bit should fix the problem above
because the reference we're initializing here is non-const.