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error: expected identifier or string literal
--> $DIR/empty-input.rs:6:14
|
LL | () => { ${concat()} }
| ^^^^^^^^^^
error: expected expression, found `$`
--> $DIR/empty-input.rs:6:13
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LL | () => { ${concat()} }
| ^ expected expression
...
LL | let x = empty!();
| -------- in this macro invocation
|
= note: this error originates in the macro `empty` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 2 previous errors
|
