Porting combined errors from mbedtls changes #380

Job	Run time
Cargo bench	6m 32s
Rustfmt	13s
Test (stable, x86_64-unknown-linux-gnu, ubuntu-20.04)	1m 19s
Test (stable, x86_64-fortanix-unknown-sgx, ubuntu-20.04)	1m 2s
Test (stable, x86_64-pc-windows-msvc, windows-latest)	1m 12s
Test (stable, x86_64-pc-windows-msvc, windows-2019)	1m 12s
Test (stable, aarch64-unknown-linux-musl, ubuntu-20.04)	1m 18s
Test (beta, x86_64-unknown-linux-gnu, ubuntu-20.04)	1m 19s
Test (nightly, x86_64-unknown-linux-gnu, ubuntu-20.04)	1m 19s
Test (stable, x86_64-apple-darwin, macos-latest)	1m 21s
ci	1s
	16m 48s

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