Check for unknown features #95
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While preserving favouring literal values where possible. Fixes #94 The story here is: #89 tried to simplify the generated code (which, among other things, made rustc not stack overflow when codegening for large enums). Unfortunately, it assumed that all explicit discriminants were literals (and non-negative ones, as `-123` parses as a `UnaryExpr` not a `Literal`). And further unfortunately, because of a typo in a `#[cfg(feature)]` attached to the only tests we had for non-literal enums, we weren't running those tests (this PR re-enables them and adds some which aren't feature gated, and #95 will ensure we don't regress in this way again). This PR attempts to preserve the "prefer just using literals rather than large chains of wrapping adds" property of #89, while also supporting non-literal cases.
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