Actually, you don’t have to write any code. Just make a new project using a 
single view application and try to build it. I’ve re-downloaded the developer 
build and even downloaded Xcode again from the App store.

Here is the error that Xcode reports:

CompileSwift normal x86_64 
/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff/iosTestforJGroff/AppDelegate.swift
    cd /Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff
    
/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-04-12-a.xctoolchain/usr/bin/swift
 -frontend -c 
/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff/iosTestforJGroff/ViewController.swift
 -primary-file 
/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff/iosTestforJGroff/AppDelegate.swift
 -target x86_64-apple-ios9.3 -enable-objc-interop -sdk 
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk
 -I 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Products/Debug-iphonesimulator
 -F 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Products/Debug-iphonesimulator
 -enable-testing -g -module-cache-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/ModuleCache 
-serialize-debugging-options -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/swift-overrides.hmap
 -Xcc -iquote -Xcc 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-generated-files.hmap
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-own-target-headers.hmap
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-all-target-headers.hmap
 -Xcc -iquote -Xcc 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-project-headers.hmap
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Products/Debug-iphonesimulator/include
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/DerivedSources/x86_64
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/DerivedSources
 -Xcc -DDEBUG=1 -Xcc 
-working-directory/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff
 -emit-module-doc-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate~partial.swiftdoc
 -Onone -module-name iosTestforJGroff -emit-module-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate~partial.swiftmodule
 -serialize-diagnostics-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.dia
 -emit-dependencies-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.d
 -emit-reference-dependencies-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.swiftdeps
 -o 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.o

Assertion failed: (UIApplicationMainFn && "UIKit not imported?"), function 
emitArtificialTopLevel, file 
/Users/buildnode/jenkins/workspace/oss-swift-package-osx/swift/lib/SILGen/SILGenFunction.cpp,
 line 508.
0  swift                    0x000000010fdb07eb 
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 43
1  swift                    0x000000010fdafa76 llvm::sys::RunSignalHandlers() + 
70
2  swift                    0x000000010fdb0ebf SignalHandler(int) + 383
3  libsystem_platform.dylib 0x00007fff9504652a _sigtramp + 26
4  swift                    0x0000000110861390 FirstTarget + 71400
5  swift                    0x000000010fdb0c96 abort + 22
6  swift                    0x000000010fdb0c71 __assert_rtn + 81
7  swift                    0x000000010d51175b 
swift::Lowering::SILGenFunction::emitArtificialTopLevel(swift::ClassDecl*) + 
5211
8  swift                    0x000000010d4b1198 
swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) 
+ 3768
9  swift                    0x000000010d4b17a0 
swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, 
swift::FileUnit*, llvm::Optional<unsigned int>, bool, bool) + 928
10 swift                    0x000000010d4b1cc5 
swift::performSILGeneration(swift::FileUnit&, swift::SILOptions&, 
llvm::Optional<unsigned int>, bool) + 117
11 swift                    0x000000010d218c47 
performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, 
llvm::ArrayRef<char const*>, int&) + 13543
12 swift                    0x000000010d2148af 
frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2879
13 swift                    0x000000010d20fdad main + 2637
14 libdyld.dylib            0x00007fff9ca3e5ad start + 1
15 libdyld.dylib            0x000000000000003b start + 1666980495
Stack dump:
0.      Program arguments: 
/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-04-12-a.xctoolchain/usr/bin/swift
 -frontend -c 
/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff/iosTestforJGroff/ViewController.swift
 -primary-file 
/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff/iosTestforJGroff/AppDelegate.swift
 -target x86_64-apple-ios9.3 -enable-objc-interop -sdk 
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk
 -I 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Products/Debug-iphonesimulator
 -F 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Products/Debug-iphonesimulator
 -enable-testing -g -module-cache-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/ModuleCache 
-serialize-debugging-options -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/swift-overrides.hmap
 -Xcc -iquote -Xcc 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-generated-files.hmap
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-own-target-headers.hmap
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-all-target-headers.hmap
 -Xcc -iquote -Xcc 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/iosTestforJGroff-project-headers.hmap
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Products/Debug-iphonesimulator/include
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/DerivedSources/x86_64
 -Xcc 
-I/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/DerivedSources
 -Xcc -DDEBUG=1 -Xcc 
-working-directory/Users/charleslane/SWDev/SwiftFiles/MiscProjects/iosTestforJGroff
 -emit-module-doc-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate~partial.swiftdoc
 -Onone -module-name iosTestforJGroff -emit-module-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate~partial.swiftmodule
 -serialize-diagnostics-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.dia
 -emit-dependencies-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.d
 -emit-reference-dependencies-path 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.swiftdeps
 -o 
/Users/charleslane/Library/Developer/Xcode/DerivedData/iosTestforJGroff-faanxccoissojpdbyetnddefzcpz/Build/Intermediates/iosTestforJGroff.build/Debug-iphonesimulator/iosTestforJGroff.build/Objects-normal/x86_64/AppDelegate.o
 

Regards,
Chuck Lane

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