message: Remove explicit compile_error.
diff: @@ -92,7 +92,3 @@ pub use crate::{
  era_id::EraId,
  uint::{UIntParseError, U128, U256, U512},
  };
  -#[cfg(not(any(feature = "std", feature = "no-std")))]
  -compile_error!(
  - "casper-types requires one of 'std' (enabled by default) or 'no-std' features to be enabled"
  -);
  