Specify and check that the @main function can't have a return type
#292
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As discussed in #281 (comment) and previously in #91, it seems like
@mainshouldn't return anything. (Maybe we will change this in the future—e.g., maybe it should be able to return an OS status code—but we can relax this requirement if we ever want to do that.)This PR adds this requirement to the docs and adds the obvious check to
brilck. The CI will fail on this PR until the benchmark from #281 is fixed to obey the new rule.