Use constant instead of removed const_in_array_repeat_expressions feature
#921
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phil-opp
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The
const_in_array_repeat_expressionsfeature was removed in rust-lang/rust#80404 because its design led to various bugs. The inline const blocks (const { ... }) feature should be a good alternative, but it is still marked as incomplete because there are still major bugs with it too. For this reason, this PR uses a localEMPTYconstant instead to not require any unstable features at all.