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indexmap
's use ofautocfg
doesn't always properly detectstd
, which is needed if you're using the defaultS
hasher. The "indexmap/std" feature will explicitly force it on.This does mean that
preserve_order
requiresstd
, but that was already effectively true by using the defaultS
. Alternatively, we could pick ano_std
hasher crate for this, or implement a simple one locally.