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error[E0658]: the `concat` meta-variable expression is unstable
--> $DIR/feature-gate-macro-metavar-expr-concat.rs:3:14
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LL | let ${concat($lhs, $rhs)}: () = ();
| ^^^^^^^^^^^^^^^^^^^^
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= note: see issue #124225 <https://github.com/rust-lang/rust/issues/124225> for more information
= help: add `#![feature(macro_metavar_expr_concat)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
|
