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error[E0277]: the trait bound `str: UpperHex` is not satisfied
  --> $DIR/ifmt-unimpl.rs:2:21
   |
LL |     format!("{:X}", "3");
   |                     ^^^ the trait `UpperHex` is not implemented for `str`
   |
   = help: the following other types implement trait `UpperHex`:
             &T
             &mut T
             NonZeroI128
             NonZeroI16
             NonZeroI32
             NonZeroI64
             NonZeroI8
             NonZeroIsize
           and 21 others
   = note: required for `&str` to implement `UpperHex`
note: required by a bound in `ArgumentV1::<'a>::new_upper_hex`
  --> $SRC_DIR/core/src/fmt/mod.rs:LL:COL
   = note: this error originates in the macro `$crate::__export::format_args` which comes from the expansion of the macro `arg_new` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.