message: Remove implicit conversion to EvalException from anyhow::Error
  Summary: Make sure it is not created accidentally without span.
diff: @@ -145,12 +145,6 @@ pub(crate) enum EvalException<'v> {
  #[derive(Debug)]
  pub(crate) struct ExprEvalException(anyhow::Error);
  -impl<'v> From<anyhow::Error> for EvalException<'v> {
  - fn from(x: anyhow::Error) -> Self {
  - Self::Error(x)
  - }
  -}
  -
  impl<'v> From<ExprEvalException> for EvalException<'v> {
  fn from(ExprEvalException(e): ExprEvalException) -> Self {
  Self::Error(e)
  