I'm trying to improve the way format_args! gets lowered in the compiler, and I want to wrap the call to Arguments::new_const in a const block expr to make sure it gets constant folded (relavant github issue), but hir::ConstBlock doesn't have an obvious method of construction.
I have a hir::ExprKind, and I somehow need to turn that into a BodyId? some of the LoweringContext methods are useful for constructing other types of expressions, but not so much for ConstBlock.
Any idea how to do this?