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Merge pull request #41992 from DougGregor/implicit-existential-opening-erase-or-reject

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Doug Gregor
2022-03-23 21:03:54 -07:00
committed by GitHub
parent 025ee1eef9 50b113e222
commit 38c9d2e8dd
6 changed files with 160 additions and 18 deletions
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11
lib/AST/Decl.cpp
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@@ -4048,9 +4048,16 @@ GenericParameterReferenceInfo swift::findGenericParameterReferences(
sig, genericParam, param.getPlainType(), TypePosition::Invariant);
continue;
}
// Parameters are contravariant, but if we're prior to the skipped
// parameter treat them as invariant because we're not allowed to
// reference the parameter at all.
TypePosition position = TypePosition::Contravariant;
if (skipParamIndex && paramIdx < *skipParamIndex)
position = TypePosition::Invariant;
inputInfo |= ::findGenericParameterReferences(
sig, genericParam, param.getParameterType(),
TypePosition::Contravariant);
sig, genericParam, param.getParameterType(), position);
}
// A covariant Self result inside a parameter will not be bona fide.