Starting download of /gnu/store/4l7wd3yfg7jp4ppjll32b5zbj6lws8gn-rust-tokio-1.2.0.tar.gz
From https://crates.io/api/v1/crates/tokio/1.2.0/download...
following redirection to `https://static.crates.io/crates/tokio/tokio-1.2.0.crate'...
GC Warning: Repeated allocation of very large block (appr. size 69632):
	May lead to memory leak and poor performance

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