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+---
+synopsis: "Fix unexpectedly-successful GC failures on macOS"
+cls: 1723
+issues: fj#446
+credits: jade
+category: Fixes
+---
+
+Has the following happened to you on macOS? This failure has been successfully eliminated, thanks to our successful deployment of advanced successful-failure detection technology (it's just `if (failed && errno == 0)`. Patent pending<sup>not really</sup>):
+
+```
+$ nix-store --gc --print-dead
+finding garbage collector roots...
+error: Listing pid 87261 file descriptors: Undefined error: 0
+```