I have a large mixed language (obj-c, swift & c++) project.
It builds and runs fine on all platforms "Build for previews" also seems to complete fine.
Opening preview of a particular swift file fails with 'Failed to launch swiftc'
The diagnostics gives:
Failed to launch swiftc.
==================================
| HumanReadableNSError: NSInvalidArgumentException
|
| com.apple.dt.PreviewsFoundation.ExceptionError (0):
| ==NSLocalizedFailureReason: too many arguments (4670) -- limit is 4096
