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