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error[E0277]: the trait bound `str: UpperHex` is not satisfied
--> $DIR/ifmt-unimpl.rs:2:21
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LL | format!("{:X}", "3");
| ---- ^^^ the trait `UpperHex` is not implemented for `str`
| |
| required by a bound introduced by this call
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= help: the following other types implement trait `UpperHex`:
isize
i8
i16
i32
i64
i128
usize
u8
and 20 others
= note: required for `&str` to implement `UpperHex`
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)
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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