Random "<unknown>:0: warning: default will never be executed" Xcode warning

Developer Tools & Services Xcode
mikhailkogan17
mikhailkogan17 OP
Created Mar ’25
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Hello!

I'm experiencing a persistent SwiftCompile warning that I haven't been able to resolve for several months:

<unknown>:0: warning: default will never be executed

Observations:

  • Appears randomly across different files during the build.
  • No source location or line highlighting is provided.
  • Persists across clean builds and project reopenings.
  • Occurs in both Xcode Cloud and local builds.

What I’ve tried:

  • Ensuring all switch statements on enums explicitly handle every case.
  • Removing default cases from fully covered enum switches.
  • Refactoring optional enum handling (e.g., using if let instead of switch).

None of these resolved the issue. Any guidance would be greatly appreciated!

Project details:

  • Xcode: 16.2
  • Swift: 6
  • iOS Target: 17.0+
  • UI: SwiftUI-only (no UIKit)
  • Dependencies: SwiftPM
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Random "&lt;unknown&gt;:0: warning: default will never be executed" Xcode warning
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