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warning: panic message is not a string literal
--> $DIR/const_panic_stability.rs:14:12
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LL | panic!({ "foo" });
| ^^^^^^^^^
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= note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
= note: `#[warn(non_fmt_panics)]` on by default
help: add a "{}" format string to `Display` the message
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LL | panic!("{}", { "foo" });
| +++++
warning: 1 warning emitted
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