[cxx-interop] Fix assertion failure when looking up C++ operators #59345
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Previously when looking up a C++ operator (e.g. `==`), `ClangImporter::Implementation::lookupValue` returned a Swift function with a generated name (e.g. `func __operatorEqualEqual`), while the caller expected the result to be a Swift operator (e.g. `func ==`). This change makes sure that we're returning a synthesized Swift operator when looking for a C++ operator. This fixes an assertion failure in the typechecker: ``` swift-frontend: /home/build-user/swift/lib/Sema/ConstraintSystem.cpp:1454: std::pair<Type, Type> swift::constraints::ConstraintSystem::getTypeOfReference(swift::ValueDecl *, swift::FunctionRefKind, swift::constraints::ConstraintLocatorBuilder, swift::DeclContext *): Assertion `func->isOperator() && "Lookup should only find operators"' failed. ```
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@swift-ci please smoke test |
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This is a requirement for #58699. |
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Merging to unblock other work, happy to discuss post-merge. |
Huddie
reviewed
Jun 10, 2022
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Previously when looking up a C++ operator (e.g.
==),ClangImporter::Implementation::lookupValuereturned a Swift function with a generated name (e.g.func __operatorEqualEqual), while the caller expected the result to be a Swift operator (e.g.func ==).This change makes sure that we're returning a synthesized Swift operator when looking for a C++ operator.
This fixes an assertion failure in the typechecker: