Fix bounds generation for generics in derive(Arbitrary) #511
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The implementation of UseTracker expects that iteration over items of used_map gives items in insertion order. However, the order of BTreeSet is based on Ord, not insertion. I use a Vec of tuples. An alternative would be indexmap crate, but since the maps are supposed to be very small, it is probably not worthy. There already was a mention about the crate in the comments worrying about compile times.
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The implementation of UseTracker expects that iteration over items of used_map gives items in insertion order. However, the order of BTreeSet is based on Ord, not insertion.
I use a Vec of tuples. An alternative would be indexmap crate, but since the maps are supposed to be very small, it is probably not worthy. There already was a mention about the crate in the comments worrying about compile times.
replaces #260