Make FnPtrN: !Sync + !Send #42
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This is intended to fix a soundness bug, since `FnPtrN`s come from closures that are !Sync + !Send.
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This is intended to fix a soundness bug, the first item in #34, namely:
The simplest fix is to make FnPtrN
!Sendand!Sync. This means we generally cannot pass our closures between threads, which may not be a satisfactory solution. An alternative PR I am working on will attempt to thread the auto traits from the original Rust closure through the Closure…N to the FnPtrN.