🐛 zd: Don't assume enum discriminant to be always a literal #1245
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Otherwise, we end up not accepting negative values for enum discriminants because `syn` parses them as `Expr::Unary`. Same for binary operations (e.g `1 << 2`).
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Otherwise, we end up not accepting negative values for enum discriminants because
synparses them asExpr::Unary. Same for binary operations (e.g1 << 2).