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Cap the lint levels to "warn". Some crate authors are anal about setting "deny(warnings)", which means that if we get a warning compiling this crate, the compile will fail. Override this by using the "--cap-lints" option. Just hardcode, as a first shot.
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A quick hardcode capping lints to warn.
Some crate authors think they know best and set "deny(warnings)", which means
that if we get a warning compiling this crate, the compile will fail.
Annoying !
In a "normal" cargo compile, cargo knows when a crate is upstream and then sets "--cap-lints" on rustc.
However, how that would work for mkRustCrate, I have no idea...
Might be as simple as adding a "source = ..." line to Cargo.lock...
A better solution would, of course, be to let cargo add the "--cap-lints" options itself on upstream crates, instead of hard coding.