ModuleCache, straight to trash.

[alloy]

fatal error: malformed or corrupted AST file: 'Unable to load module "/Users/eloy/Code/Artsy/eigen/DerivedData/ModuleCache/1D1S9X2Y9W78O/Darwin-1S7E5D7C9EQXA.pcm": module file not found'
note: after modifying system headers, please delete the module cache at '/Users/eloy/Code/Artsy/eigen/DerivedData/ModuleCache/1D1S9X2Y9W78O'
1 error generated.

[alloy]

Err, the reported dir doesn’t even exist :-/

[alloy]

Had to completely trash DerivedData.

[alloy]

Happened again when I tried to build a debug build for a device and again had to trash all of DerivedData.