[5.9][Macros] Add back the ExtensionMacro feature identifier as a LANGUAGE_FEATURE for use in swiftinterfaces.
#67628
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… feature that can be used in swiftinterfaces. (cherry picked from commit 4b09d4c)
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@swift-ci please test |
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@swift-ci please test Linux |
DougGregor
approved these changes
Jul 31, 2023
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ExtensionMacrosfeature identifier was recently removed with the acceptance of SE-0402. However, if a swiftinterfaces uses#if $ExtensionMacros, this condition will now evaluate to false for compilers that have the implementation of extension macros, but have the experimental feature removed. Add the identifier back as a language feature to preserve the behavior of#if $ExtensionMacrosin swiftinterfaces.#if $ExtensionMacrosand applies the macro declared inside the condition.ExtensionMacrofeature identifier as aLANGUAGE_FEATUREfor use in swiftinterfaces. #67627