If a key is inserted that is less than or equal to any previous key added, then an error is returned. Similarly, if there was a problem writing to the underlying writer, an error is returned.
Given that this crate only uses MapBuilder::memory, there is no error from underlying writer (since Rust's allocation is infallible). The key inserting order should be promised by this crate, and shouldn't be propagated to users.
fst::MapBuildersaysGiven that this crate only uses
MapBuilder::memory, there is no error from underlying writer (since Rust's allocation is infallible). The key inserting order should be promised by this crate, and shouldn't be propagated to users.I think you can unwrap the errors.