[Pitch #2] DebugDescription macro

@Dave_Lee Hi! The new WWDC video on debugging features the @DebugDescription macro… but I see no mention in the video of this being an "experimental" feature. Is there anything (other than the WWDC video) engineers should know before using this macro (assuming they are building from a 6.0 toolchain)? Thanks!

The macro is currently an experimental feature in the compiler. However, the Xcode build system (in Xcode 16 beta) enables the macro by passing -enable-experimental-feature DebugDescriptionMacro.

The macro is undergoing the Swift Evolution process, any changes will be discussed here on the forums.

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