$ ./run.sh red2.swift
red2.swift:5:5: warning: immutable value 'i' was never used; consider replacing with '_' or removing it
for i in 0..<3 {
    ^
    _
red2.swift:7:5: warning: immutable value 'i' was never used; consider replacing with '_' or removing it
for i in 0..<3 {
    ^
    _
argument passed to call that takes no arguments
0  swiftc                   0x000000010468c16a PrintStackTraceSignalHandler(void*) + 42
1  swiftc                   0x000000010468b526 SignalHandler(int) + 966
2  libsystem_platform.dylib 0x00007fff63331f5a _sigtramp + 26
3  libsystem_platform.dylib 0x00007ffeeef318b0 _sigtramp + 2344614256
4  swiftc                   0x0000000102044869 swift::ASTVisitor<(anonymous namespace)::Traversal, swift::Expr*, swift::Stmt*, bool, swift::Pattern*, bool, void>::visit(swift::Stmt*) +
425
5  swiftc                   0x0000000101d6126d swift::TypeChecker::checkFunctionErrorHandling(swift::AbstractFunctionDecl*) + 525
6  swiftc                   0x0000000101cebb4f swift::performPCMacro(swift::SourceFile&, swift::TopLevelContext&)::ExpressionFinder::walkToDeclPre(swift::Decl*) + 2367
7  swiftc                   0x0000000102043e41 (anonymous namespace)::Traversal::doIt(swift::Decl*) + 273
8  swiftc                   0x0000000101a722ef swift::CompilerInstance::performSema() + 5679
9  swiftc                   0x0000000100d42558 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 1704
10 swiftc                   0x0000000100d40444 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 7876
11 swiftc                   0x0000000100cf5205 main + 18917
12 libdyld.dylib            0x00007fff630b0115 start + 1
13 libdyld.dylib            0x0000000000000006 start + 2633301746
Stack dump:
0.      Program arguments: 
swiftc -frontend -c -primary-file red2.swift -pc-macro
./run.sh: line 4: 95284 Segmentation fault: 11  swiftc -frontend -c -primary-file $1 -pc-macro

func __builtin_pc_before(_ sl : Int, _ el : Int, _ sc : Int, _ ec: Int) {
}
func __builtin_pc_after() {
}
for i in 0..<3 {
}
for i in 0..<3 {
}