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Preserve bindings after failed type unification - #1784
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dajiaohuang wants to merge 3 commits into
Closed
dajiaohuang wants to merge 3 commits into
dajiaohuang wants to merge 3 commits into
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Unify builds candidate bindings locally and only writes to the caller's map after success, but on failure it clears the map. This destroys bindings supplied on entry, even though the API uses those entries as preexisting constraints. Leave the input map unchanged on failure and add a regression test.
Review update: the unrelated generic-instantiation change and its fixture were removed through a normal follow-up commit; #1764 tracks that fix separately. Current-head validation: go test ./go/types/typeutil (two tests) passed; git diff --check passed. Prior validation text above is historical unless repeated here.