macro-string 0.2.0

Eager evaluation of macros like `concat!` and `env!`
Documentation 
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error: a relative path is not supported here; use `include_str!(concat!(env!("CARGO_MANIFEST_DIR"), ...))`
 --> tests/ui/relative_path.rs:3:23
  |
3 | const _: &str = eval!(include_str!("relative/path.rs"));
  |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^