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05ea0e77d9
When performing C++ overload resolution with an argument that is of
Carbon struct or tuple type, form a braced initializer list as the
placeholder argument. Note that this only affects overload resolution;
no new support for actually converting structs or tuples to C++ types is
added. In particular, while this does allow an empty class to be
initialized from `{}`, it does not allow a non-empty C++ class to be
initialized from a struct, as that is not yet supported in general.
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Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
Co-authored-by: Geoff Romer <gromer@google.com>