Forgetting to run Contract::preflight results in difficult to debug error

[nategraf]

An application developer using Steel ran into an issue when using Steel when they forgot to run Contract::preflight on the host. It is expected that this will result in a failure. However the following assert was what caught the issue, and they had a very difficult time debugging it.

risc0-ethereum/steel/src/block.rs

Line 35 in 8dc7287

assert_eq!(self.header.state_root(), &state_root, "State root mismatch");

It is likely this will be a common error, and so we should make it easier to figure out how to fix it.

[linear]

WEB3-107 Forgetting to run `Contract::preflight` results in difficult to debug error