message: uncomment compile_error! guard
diff: @@ -97,7 +97,7 @@ pub use crate::{
  compile_error!(
  "casper-types requires one of 'std' (enabled by default) or 'no-std' features to be enabled"
  );
  -// #[cfg(all(feature = "std", feature = "no-std"))]
  -// compile_error!(
  -// "casper-types features 'std' (enabled by default) and 'no-std' should not both be enabled"
  -// );
  +#[cfg(all(feature = "std", feature = "no-std"))]
  +compile_error!(
  + "casper-types features 'std' (enabled by default) and 'no-std' should not both be enabled"
  +);
  