Function check_int_to_ptr_transmute 

fn check_int_to_ptr_transmute<'tcx>(
    cx: &LateContext<'tcx>,
    expr: &'tcx Expr<'tcx>,
    arg: &'tcx Expr<'tcx>,
    src: Ty<'tcx>,
    dst: Ty<'tcx>,
)

Check for transmutes from integer to pointers (*const/*mut and &/&mut).

Using the resulting pointers would be undefined behavior.