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[Runtime] Don't check suppressed protocols when the extended existential is metatype constrained #84921

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Merged
merged 1 commit into from
Oct 20, 2025
Merged

[Runtime] Don't check suppressed protocols when the extended existential is metatype constrained #84921

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8 changes: 8 additions & 0 deletions stdlib/public/runtime/ProtocolConformance.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2229,6 +2229,14 @@ checkInvertibleRequirementsStructural(const Metadata *type,
case MetadataKind::ExtendedExistential: {
auto existential = cast<ExtendedExistentialTypeMetadata>(type);
auto &shape = *existential->Shape;

// If this is an extended existential metatype, then just allow it. Metatypes
// are always copyable and escapable so there can't possibly be a
// suppression issue.
if (shape.Flags.isMetatypeConstrained()) {
return std::nullopt;
}

llvm::ArrayRef<GenericRequirementDescriptor> reqs(
shape.getReqSigRequirements(), shape.getNumReqSigRequirements());
// Look for any suppressed protocol requirements. If the existential
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18 changes: 18 additions & 0 deletions test/Interpreter/extended_existential.swift
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Expand Up @@ -49,3 +49,21 @@ print(h)
let i: Any = (any A & B & ~Copyable).self
// CHECK: any A & B<Self: ~Swift.Copyable>
print(i)

@inline(never)
func test() -> Bool {
return [].first == nil
}

// CHECK: true
print(test())

let j: [any (~Copyable & ~Escapable).Type] = []

// CHECK: Array<any Any<Self: ~Swift.Copyable, Self: ~Swift.Escapable>.Type>
print(type(of: j))

let k: [(any ~Copyable & ~Escapable).Type] = []

// CHECK: Array<(any Any<Self: ~Swift.Copyable, Self: ~Swift.Escapable>).Type>
print(type(of: k))