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Filter to the host platform when running the default command #313
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Fixes #312.
This uses the same logic that
cargo
does to identify the host platform, which unfortunately requires a call torustc
.We invoke this logic if the user did not provide any of their own commands in the invocation to
cargo watch
-- this is probably more conservative than it strictly needs to be. If the user invokes acargo
subcommand, for instance, we may know enough about the subcommand and its arguments to know that it's still possible to filter to the host platform. I avoided adding that additional complexity for now but it could easily be added in the future.