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error[E0658]: use of unstable library feature 'concat_idents': `concat_idents` is not stable enough for use and is subject to change
--> $DIR/feature-gate-concat_idents2.rs:2:5
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LL | concat_idents!(a, b);
| ^^^^^^^^^^^^^
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= note: see issue #29599 <https://github.com/rust-lang/rust/issues/29599> for more information
= help: add `#![feature(concat_idents)]` to the crate attributes to enable
error[E0425]: cannot find value `ab` in this scope
--> $DIR/feature-gate-concat_idents2.rs:2:5
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LL | concat_idents!(a, b);
| ^^^^^^^^^^^^^^^^^^^^ not found in this scope
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= note: this error originates in the macro `concat_idents` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0425, E0658.
For more information about an error, try `rustc --explain E0425`.
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