macro-string 0.2.0

Eager evaluation of macros like `concat!` and `env!`
Documentation 
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error: No such file or directory (os error 2) $DIR/target/tests/trybuild/macro-string/nonexist.ent
 --> tests/ui/no_such_file.rs:3:23
  |
3 | const _: &str = eval!(include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/nonexist.ent")));
  |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^