note: required by a bound in `core::fmt::rt::Argument::<'a>::new_upper_hex`
--> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
= note: this error originates in the macro `$crate::__export::format_args` which comes from the expansion of the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)