Fix LIST.in hook for non-constructor-like list elements #4111
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The previous list hook implementation `LIST.in` was testing membership based on _syntactic_ equality. This is incorrect if the elements of the list are not constructor-like (like variables or unevaluated function calls), `False` cannot be returned in those cases. When all known list elements are constructor-like, syntactic equality is sufficient. A unit test was added for this case.
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The symptom that led to discovering this bug was a kontrol end-to-end test: https://github.com/runtimeverification/kontrol/actions/runs/15538343867/job/43743019572?pr=1032#step:6:58 |
tothtamas28
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Jun 16, 2025
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The previous list hook implementation
LIST.inwas testing membership based on syntactic equality. This is incorrect if the elements of the list are not constructor-like (like variables or unevaluated function calls),Falsecannot be returned in those cases. When all known list elements are constructor-like, syntactic equality is sufficient. A unit test was added for this case.