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The wasmtime driver program (src/wasmtime.rs) currently uses docopt to parse command-line arguments. clif-util in Cranelift switched from docopt to [clap](https://crates.io/crates/clap) because it's simpler and has better support for subcommands and seems to be more popular in the Rust ecosystem, so it'd make sense to convert wasmtime to use clap too.