Fix simplified open options

heed/src/lib.rs

@@ -75,6 +75,7 @@ mod txn;
 use std::ffi::CStr;
 use std::{error, fmt, io, mem, result};
 
+use env::SimplifiedOpenOptions;
 use heed_traits as traits;
 pub use {byteorder, heed_types as types};
 
@@ -154,6 +155,10 @@ pub enum Error {
     /// Attempt to open [`Env`] with different options.
     BadOpenOptions {
         /// The options that were used to originally open this env.
+        #[cfg(master3)]
+        original_options: SimplifiedOpenOptions,
+        /// The options that were used to originally open this env.
+        #[cfg(not(master3))]
         options: EnvOpenOptions,
         /// The env opened with the original options.
         env: Env,