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Set non-membership and rules excluding certain sorts?

See original GitHub issue

Is there a way to pattern match on whether an element E is definitely not in some set S? Additionally, if I have a rule: rule V:Val => OP, is there a way to apply this rule only if Val is not an instance of, say, KVar?

Issue Analytics

State:
Created 4 years ago
Comments:5 (3 by maintainers)

Top GitHub Comments

1reaction

dwightguthcommented, May 13, 2019

You can get the domain of a map by saying keys(M) which means technically you can check whether something is in the domain of a map by saying E in keys(M), but this is rather inefficient because it has to construct an entirely new collection. For a simple membership check, we have an explicit function for this: E in_keys(M) (note the underscore instead of a space)

1reaction

dwightguthcommented, May 13, 2019

in terms of the second one, you can say requires notBool isKVar(V)

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