Critical Description
It is very hard to track which expression supports code generation or not. This patch removes the default gencode implementation from Expression, and moves the default fallback implementation into a new trait called CodegenFallback. Each concrete expression needs to either implement code generation, or mix in CodegenFallback. This makes it very easy to track which expressions have code generation implemented already.
Additionally, this patch creates an Unevaluable trait that can be used to track expressions that don't support evaluation (e.g. Star).
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