{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
    let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes() as usize;
pub(crate) fn size_of_obj(fx: &mut FunctionCx<'_, '_, '_>, vtable: Value) -> Value {
    fx.bcx.ins().load(