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error: const-stable function cannot use `#[feature(const_fn_floating_point_arithmetic)]`
--> $DIR/internal-unstable-const.rs:10:5
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LL | 1.0 + 1.0
| ^^^^^^^^^
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help: if it is not part of the public API, make this function unstably const
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LL + #[rustc_const_unstable(feature = "...", issue = "...")]
LL | pub const fn foo() -> f32 {
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help: otherwise `#[rustc_allow_const_fn_unstable]` can be used to bypass stability checks
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LL + #[rustc_allow_const_fn_unstable(const_fn_floating_point_arithmetic)]
LL | pub const fn foo() -> f32 {
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error: aborting due to 1 previous error
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