macro-string 0.2.0

Eager evaluation of macros like `concat!` and `env!`
Documentation 
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error: unsupported macro, expected one of: `concat!`, `env!`, `include!`, `include_str!`, `stringify!`
 --> tests/ui/unsupported_macro.rs:3:23
  |
3 | const _: &str = eval!(include_bytes!("..."));
  |                       ^^^^^^^^^^^^^^