{"ast_node_type":"function","tokens":[{"end":26,"kind":"keyword","start":0,"text":"fn"}]}
fn pack_instruction<'tcx>(
/// Validated for correctness against LLVM, see commit `c8f5d35508e062bd2d95e6c03429bfec831db6d3`.
    fx: &mut FunctionCx<'_, '_, 'tcx>,