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failure::format_err! calls format! internally. And std::fmt::Arguments(called by format!) are not implemented Send, so any future containing them will not be implemented Send.
If using format_err! macro inside try_stream!:
It doesn't compile -
*mut (dyn std::ops::Fn() + 'static)
cannot be shared between threads safely.But when using it without format_err!:
Compiler says all Ok.
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