[Macros] Don't require a declaration of #externalMacro.
#64302
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To enable the declaration and use of macros from a newer Swift compiler, when the standard library is from an older Swift compiler that doesn't provide a declaration of `externalMacro`, short-circuit the type-checking of `#externalMacro(module: "A", type: "B")` when it is used to declare a new macro.
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@swift-ci please smoke test and merge |
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To enable the declaration and use of macros from a newer Swift compiler, when the standard library is from an older Swift compiler that doesn't provide a declaration of
externalMacro, short-circuit the type-checking of#externalMacro(module: "A", type: "B")when it is used to declare a new macro.