Fix type inference error reported in #43064. #46302
Merged
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This PR fixes the subtype bug reported in #43064.
Before this PR,
exists_subtype
would erase the under-processing value inenvout
ifsubtype
returnfalse
, but we should actually keep it as the nextsubtype_unionall
needs it to check whether we have assigned a (different) environment value. 7c76a97 skips the erasing if there are remaing Runions to test.(#41096 is still broken, as the root cause looks different)