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Motivation
#817
Error::cause is deprecated in Rust 1.33, but Error::source, which replaces it, has been stabilized in Rust 1.30 (the minimum version of tokio is Rust 1.26)..
Solution
Allow Error::cause until the minimum supported version of tokio is Rust 1.30.
When the minimum support version of tokio reaches Rust 1.30, replace Error::cause with Error::source.