[-Ztrait-solver=next, mir-typeck] instantiate hidden types in the root universe Fixes an ICE in the test `member-constraints-in-root-universe`. Main motivation is to make #112691 pass under the new solver. r? ``@compiler-errors``
{Idx, IndexVec, IndexSlice}
rustc_const_eval
&format
BorrowKind::Unique
BorrowKind::Mut
mut
tcx.mk_re_*
Region::new_*
mir::Field
abi::FieldIdx