Adopt _CFErrorCopyCallStackReturnAddresses().
#1344
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This PR adopts a Core Foundation function, new in macOS 15.4/etc. and added for us to use, that captures backtraces for `NSError` and `CFError` instances at initialization time and stores them in a sidecar location for consumption by Swift Testing and/or XCTest. Upstreaming from Apple's fork (rdar://139841808, 508230a)
grynspan
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stmontgomery,
briancroom,
suzannaratcliff and
jerryjrchen
as code owners
grynspan
added
enhancement
stmontgomery
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Sep 30, 2025
grynspan
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This PR adopts a Core Foundation function, new in macOS 15.4/etc. and added for us to use, that captures backtraces for
NSErrorandCFErrorinstances at initialization time and stores them in a sidecar location for consumption by Swift Testing and/or XCTest.Upstreaming from Apple's fork (rdar://139841808, 508230a + dd7bae2)
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