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error[E0277]: `MyError` doesn't implement `std::fmt::Display`
--> tests/ui/missing-display.rs:4:10
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4 | pub enum MyError {
| ^^^^^^^ `MyError` cannot be formatted with the default formatter
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= help: the trait `std::fmt::Display` is not implemented for `MyError`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
note: required by a bound in `std::error::Error`
--> $RUST/core/src/error.rs
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| pub trait Error: Debug + Display {
| ^^^^^^^ required by this bound in `Error`
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