CompilerCrash

Stack dump:
0.	Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret run.swift -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -color-diagnostics -module-name run
1.	While type-checking 'init(_:)' (at run.swift:2:12)
2.	While type-checking statement at [run.swift:2:36 - line:5:5] RangeText="{
        let components: [Substring] = string.split(separator: ".")
        guard let major: Int = components.first.flatMap(Int.init) else { return nil }
    "
3.	While type-checking statement at [run.swift:4:9 - line:4:85] RangeText="guard let major: Int = components.first.flatMap(Int.init) else { return nil "
4.	While type-checking expression at [run.swift:4:32 - line:4:65] RangeText="components.first.flatMap(Int.init"
0  swift                    0x00000001131c2ee3 PrintStackTraceSignalHandler(void*) + 51
1  swift                    0x00000001131c26bc SignalHandler(int) + 348
2  libsystem_platform.dylib 0x00007fff59a08b5d _sigtramp + 29
3  libsystem_platform.dylib 0x00007ffee0c6b2d0 _sigtramp + 2267424656
4  swift                    0x00000001101b9f36 swift::constraints::RequirementFailure::getRequirementDC() const + 22
5  swift                    0x00000001101b94c5 swift::constraints::RequirementFailure::diagnoseAsError() + 69
6  swift                    0x00000001101b5804 swift::constraints::MissingConformance::diagnose(swift::Expr*, bool) const + 500
7  swift                    0x00000001100e7344 swift::Expr* llvm::function_ref<swift::Expr* (swift::Expr*)>::callback_fn<swift::constraints::ConstraintSystem::applySolutionFixes(swift::Expr*, swift::constraints::Solution const&)::$_11>(long, swift::Expr*) + 228
8  swift                    0x000000011061c77e swift::Expr::forEachChildExpr(llvm::function_ref<swift::Expr* (swift::Expr*)>)::ChildWalker::walkToExprPre(swift::Expr*) + 14
9  swift                    0x00000001105c8bed swift::ASTVisitor<(anonymous namespace)::Traversal, swift::Expr*, swift::Stmt*, bool, swift::Pattern*, bool, void>::visit(swift::Expr*) + 205
10 swift                    0x00000001105cca23 (anonymous namespace)::Traversal::visitApplyExpr(swift::ApplyExpr*) + 211
11 swift                    0x000000011027eaec swift::TypeChecker::typeCheckExpressionImpl(swift::Expr*&, swift::DeclContext*, swift::TypeLoc, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener&, swift::constraints::ConstraintSystem*) + 2716
12 swift                    0x00000001102821de swift::TypeChecker::typeCheckBinding(swift::Pattern*&, swift::Expr*&, swift::DeclContext*, bool) + 350
13 swift                    0x0000000110284533 swift::TypeChecker::typeCheckStmtCondition(llvm::MutableArrayRef<swift::StmtConditionElement>&, swift::DeclContext*, swift::Diag<>) + 339
14 swift                    0x000000011031b826 swift::ASTVisitor<(anonymous namespace)::StmtChecker, void, swift::Stmt*, void, void, void, void>::visit(swift::Stmt*) + 710
15 swift                    0x0000000110321621 bool (anonymous namespace)::StmtChecker::typeCheckStmt<swift::Stmt>(swift::Stmt*&) + 129
16 swift                    0x0000000110320ddc swift::ASTVisitor<(anonymous namespace)::StmtChecker, void, swift::Stmt*, void, void, void, void>::visit(swift::Stmt*) + 22652
17 swift                    0x000000011031b501 bool (anonymous namespace)::StmtChecker::typeCheckStmt<swift::BraceStmt>(swift::BraceStmt*&) + 129
18 swift                    0x000000011031a8ff swift::TypeChecker::typeCheckAbstractFunctionBodyUntil(swift::AbstractFunctionDecl*, swift::SourceLoc) + 1727
19 swift                    0x000000011032276e swift::TypeChecker::typeCheckAbstractFunctionBody(swift::AbstractFunctionDecl*) + 558
20 swift                    0x000000011033ec5e swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int) + 1678
21 swift                    0x000000010fb1d036 swift::CompilerInstance::performSemaUpTo(swift::SourceFile::ASTStage_t) + 4614
22 swift                    0x000000010f01b2f6 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 838
23 swift                    0x000000010f0176de swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 6862
24 swift                    0x000000010efb57be main + 1246
25 libdyld.dylib            0x00007fff598233d5 start + 1
[1]    14713 segmentation fault  swift run.swift