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Revert "[ConstraintSystem] C++ Interop: Binding a string literal to std.string shouldn't increase the score"

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This reverts commit cd9c37ca

This is causing build failures for some projects. We need more time to investigate. Reverting this temporarily in the meantime.

rdar://158439395
This commit is contained in:
Egor Zhdan
2025-11-05 11:19:11 -08:00
parent 2b4737585d
commit 6852bc9834
6 changed files with 4 additions and 75 deletions
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25
lib/Sema/ConstraintSystem.cpp
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@@ -257,28 +257,11 @@ void ConstraintSystem::assignFixedType(TypeVariableType *typeVar, Type type,
// If the protocol has a default type, check it.
if (auto defaultType = TypeChecker::getDefaultType(literalProtocol, DC)) {
auto isDefaultType = [&literalProtocol, &defaultType](Type type) {
// Treat `std.string` as a default type just like we do
// Swift standard library `String`. This helps to disambiguate
// operator overloads that use `std.string` vs. a custom C++
// type that conforms to `ExpressibleByStringLiteral` as well.
//
// This doesn't clash with String because inference won't attempt
// C++ types unless we discover them from a constraint and the
// optimizer and old hacks always prefer the actual default type.
if (literalProtocol->getKnownProtocolKind() ==
KnownProtocolKind::ExpressibleByStringLiteral &&
type->isCxxString()) {
return true;
}
// Check whether the nominal types match. This makes sure that we
// properly handle Array vs. Array<T>.
return defaultType->getAnyNominal() == type->getAnyNominal();
};
if (!isDefaultType(type))
// Check whether the nominal types match. This makes sure that we
// properly handle Array vs. Array<T>.
if (defaultType->getAnyNominal() != type->getAnyNominal()) {
increaseScore(SK_NonDefaultLiteral, locator);
}
}
break;