message: removed VmError::BackendErr as it is now deprecated
diff: @@ -5,12 +5,6 @@ use snafu::Snafu;
  #[derive(Debug, Snafu)]
  #[non_exhaustive]
  pub enum VmError {
  - /// An error coming from the backend (i.e. the chain)
  - #[snafu(display("Backend error: {}", msg))]
  - BackendErr {
  - msg: String,
  - backtrace: snafu::Backtrace,
  - },
  #[snafu(display("Cache error: {}", msg))]
  CacheErr {
  msg: String,
  @@ -129,10 +123,6 @@ impl From<wasmer_runtime_core::error::RuntimeError> for VmError {
  pub type VmResult<T> = core::result::Result<T, VmError>;
  -pub fn make_backend_err<S: Into<String>>(msg: S) -> VmError {
  - BackendErr { msg: msg.into() }.build()
  -}
  -
  pub fn make_cache_err<S: Into<String>>(msg: S) -> VmError {
  CacheErr { msg: msg.into() }.build()
  }
  @@ -275,15 +265,6 @@ where
  mod test {
  use super::*;
  - #[test]
  - fn make_backend_err_works() {
  - let err = make_backend_err("something went wrong");
  - match err {
  - VmError::BackendErr { msg, .. } => assert_eq!(msg, "something went wrong"),
  - _ => panic!("Unexpected error"),
  - }
  - }
  -
  #[test]
  fn make_cache_err_works() {
  let err = make_cache_err("something went wrong");
  