Enable tokio's "net" feature in the virtual-net crate #4068
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Description
The
virtual-net
crate forgot to enable Tokio'snet
feature wheneverhost-net
is enabled, so it won't compile by itself.That seems to be what caused
make test-build-docs-rs
to fail onmaster
... We only discovered this missing feature flag because #4064 told docs.rs to activate thehost-net
feature, and that test iterates through each crate and builds it with the same feature flags and--cfg=docsrs
that docs.rs would use.This fixes #4066.