error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:3:10 | LL | ${ count($e) } | ^^^^^^^^^^^^^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:11:16 | LL | ( $$( $$any:tt )* ) => { $$( $$any )* }; | ^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:11:20 | LL | ( $$( $$any:tt )* ) => { $$( $$any )* }; | ^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:11:39 | LL | ( $$( $$any:tt )* ) => { $$( $$any )* }; | ^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:11:43 | LL | ( $$( $$any:tt )* ) => { $$( $$any )* }; | ^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:22:13 | LL | $( ${ignore($e)} ${index()} )* | ^^^^^^^^^^^^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:22:27 | LL | $( ${ignore($e)} ${index()} )* | ^^^^^^^^^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:30:19 | LL | 0 $( + 1 ${ignore($i)} )* | ^^^^^^^^^^^^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` 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[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:37:13 | LL | $( ${ignore($e)} ${length()} )* | ^^^^^^^^^^^^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` 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[E0658]: meta-variable expressions are unstable --> $DIR/required-feature.rs:37:27 | LL | $( ${ignore($e)} ${length()} )* | ^^^^^^^^^^ | = note: see issue #83527 for more information = help: add `#![feature(macro_metavar_expr)]` 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 10 previous errors For more information about this error, try `rustc --explain E0658`.