vagrant@vagrant-ubuntu-wily-64:~/Documents/Write-Up-4/problem2/Sources$ cat main.swift 
print(Array("asdf".characters)[0])
vagrant@vagrant-ubuntu-wily-64:~/Documents/Write-Up-4/problem2/Sources$ swiftc main.swift 
swift: /home/buildnode/jenkins/workspace/oss-swift-3.0-package-linux-ubuntu-15_10/swift/lib/Sema/ConstraintGraph.cpp:207: void swift::constraints::ConstraintGraphNode::addFixedBinding(swift::TypeVariableType *): Assertion `!adjacency.FixedBinding && "Already marked as a fixed binding?"' failed.
0  swift           0x0000000003342e68 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  swift           0x0000000003341666 llvm::sys::RunSignalHandlers() + 54
2  swift           0x0000000003343996
3  libpthread.so.0 0x00007f3e37301d10
4  libc.so.6       0x00007f3e35c491c7 gsignal + 55
5  libc.so.6       0x00007f3e35c4ae2a abort + 362
6  libc.so.6       0x00007f3e35c420bd
7  libc.so.6       0x00007f3e35c42172
8  swift           0x0000000000ffdbb2
9  swift           0x0000000000f5647e swift::constraints::ConstraintSystem::assignFixedType(swift::TypeVariableType*, swift::Type, bool) + 366
10 swift           0x0000000000fbd11f swift::constraints::ConstraintSystem::matchTypes(swift::Type, swift::Type, swift::constraints::TypeMatchKind, unsigned int, swift::constraints::ConstraintLocatorBuilder) + 3183
11 swift           0x0000000000fc0e27 swift::constraints::ConstraintSystem::matchFunctionTypes(swift::FunctionType*, swift::FunctionType*, swift::constraints::TypeMatchKind, unsigned int, swift::constraints::ConstraintLocatorBuilder) + 631
12 swift           0x0000000000fc0030 swift::constraints::ConstraintSystem::matchTypes(swift::Type, swift::Type, swift::constraints::TypeMatchKind, unsigned int, swift::constraints::ConstraintLocatorBuilder) + 15232
13 swift           0x0000000000fc9206 swift::constraints::ConstraintSystem::simplifyConstraint(swift::constraints::Constraint const&) + 630
14 swift           0x0000000000f575d7 swift::constraints::ConstraintSystem::addConstraint(swift::constraints::Constraint*, bool, bool) + 23
15 swift           0x0000000000f5b716 swift::constraints::ConstraintSystem::resolveOverload(swift::constraints::ConstraintLocator*, swift::Type, swift::constraints::OverloadChoice) + 2230
16 swift           0x0000000000fc9328 swift::constraints::ConstraintSystem::simplifyConstraint(swift::constraints::Constraint const&) + 920
17 swift           0x0000000000fd1c7b swift::constraints::ConstraintSystem::solveSimplified(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 11211
18 swift           0x0000000000fcda73 swift::constraints::ConstraintSystem::solveRec(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 323
19 swift           0x0000000000fd1d8d swift::constraints::ConstraintSystem::solveSimplified(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 11485
20 swift           0x0000000000fcda73 swift::constraints::ConstraintSystem::solveRec(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 323
21 swift           0x0000000000fd1d8d swift::constraints::ConstraintSystem::solveSimplified(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 11485
22 swift           0x0000000000fcda73 swift::constraints::ConstraintSystem::solveRec(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 323
23 swift           0x0000000000fcd829 swift::constraints::ConstraintSystem::solve(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 73
24 swift           0x0000000000eb3688 swift::TypeChecker::solveForExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::FreeTypeVariableBinding, swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem&, llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>) + 808
25 swift           0x0000000000eb98dd swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::TypeLoc, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem*) + 621
26 swift           0x0000000000f35cee
27 swift           0x0000000000f34fd6 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134
28 swift           0x0000000000ef006d swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int, unsigned int) + 1133
29 swift           0x0000000000c7b2a9 swift::CompilerInstance::performSema() + 3289
30 swift           0x00000000007dadcf
31 swift           0x00000000007d9ea1 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2833
32 swift           0x00000000007a693b main + 2603
33 libc.so.6       0x00007f3e35c34ac0 __libc_start_main + 240
34 swift           0x00000000007a44b9 _start + 41
Stack dump:
0.  Program arguments: /home/vagrant/bin/swift-3.0-RELEASE-ubuntu15.10/usr/bin/swift -frontend -c -primary-file main.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -color-diagnostics -module-name main -o /tmp/main-6b6ef8.o 
1.  While type-checking expression at [main.swift:1:1 - line:1:34] RangeText="print(Array("asdf".characters)[0])"
<unknown>:0: error: unable to execute command: Aborted
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)
vagrant@vagrant-ubuntu-wily-64:~/Documents/Write-Up-4/problem2/Sources$ cat main2.swift 
let a = Array("asdf".characters)
print(a[0])
vagrant@vagrant-ubuntu-wily-64:~/Documents/Write-Up-4/problem2/Sources$ swiftc main2.swift 
vagrant@vagrant-ubuntu-wily-64:~/Documents/Write-Up-4/problem2/Sources$ ./main2
a
vagrant@vagrant-ubuntu-wily-64:~/Documents/Write-Up-4/problem2/Sources$