Tighten product match logic in irrefutable check #13962
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This avoids accidentally considering refutable name-based extractors as irrefutable because they also happen to be a Product. With this change some tests no longer go through the Typ to Prod rewrite that occurs in `minus(a, b)` when `a` is a Typ and `b` is a Prod, leading to a Typ result. This renders in the counter-example as a generic value type rather than a product, which we see in the warning text changes in the tests. Co-authored-by: Gagandeep Kalra <gagandeepkalra1994@gmail.com> Co-authored-by: Mark T. Kennedy <mtk@acm.org>
anatoliykmetyuk
approved these changes
Nov 19, 2021
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This avoids accidentally considering refutable name-based extractors as
irrefutable because they also happen to be a Product.
With this change some tests no longer go through the Typ to Prod rewrite
that occurs in
minus(a, b)whenais a Typ andbis a Prod,leading to a Typ result. This renders in the counter-example as a
generic value type rather than a product, which we see in the warning
text changes in the tests.