Open Radar

 
This fragment crashes the compiler in a project or playground:

func crash(fooPart: String = "foo", @noescape closure: () -> String?) {}
crash(“a” + "b")

I know the signatures don’t match, but the compiler shouldn’t crash. Here’s a trace from a test project:

CompileSwift normal x86_64 /Users/garth/Library/Playgrounds/CrashProject/CrashProject/AppDelegate.swift
    cd /Users/garth/Library/Playgrounds/CrashProject
    /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c /Users/garth/Library/Playgrounds/CrashProject/CrashProject/ViewController.swift /Users/garth/Library/Playgrounds/CrashProject/Crash.swift -primary-file /Users/garth/Library/Playgrounds/CrashProject/CrashProject/AppDelegate.swift -target x86_64-apple-ios9.0 -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk -I /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Products/Debug-iphonesimulator -F /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Products/Debug-iphonesimulator -enable-testing -g -module-cache-path /Users/garth/Library/Developer/Xcode/DerivedData/ModuleCache -serialize-debugging-options -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-generated-files.hmap -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-own-target-headers.hmap -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-all-target-headers.hmap -Xcc -iquote -Xcc /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-project-headers.hmap -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/DerivedSources/x86_64 -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -working-directory/Users/garth/Library/Playgrounds/CrashProject -emit-module-doc-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate~partial.swiftdoc -Onone -module-name CrashProject -emit-module-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate~partial.swiftmodule -serialize-diagnostics-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.dia -emit-dependencies-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.d -emit-reference-dependencies-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.swiftdeps -o /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.o

Assertion failed: (!failed && "Call arguments did not match up?"), function coerceCallArguments, file /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-700.0.52.2/src/swift/lib/Sema/CSApply.cpp, line 4085.
0  swift                    0x000000010ed36bbb llvm::sys::PrintStackTrace(__sFILE*) + 43
1  swift                    0x000000010ed372fb SignalHandler(int) + 379
2  libsystem_platform.dylib 0x00007fff9271cf1a _sigtramp + 26
3  libsystem_platform.dylib 0x00007fff52f0af80 _sigtramp + 3229540480
4  libsystem_c.dylib        0x00007fff886809b3 abort + 129
5  libsystem_c.dylib        0x00007fff88648a99 basename + 0
6  swift                    0x000000010d3202df (anonymous namespace)::ExprRewriter::coerceCallArguments(swift::Expr*, swift::Type, swift::constraints::ConstraintLocatorBuilder) + 5951
7  swift                    0x000000010d311878 (anonymous namespace)::ExprRewriter::finishApply(swift::ApplyExpr*, swift::Type, swift::constraints::ConstraintLocatorBuilder) + 728
8  swift                    0x000000010d31843e swift::ASTVisitor<(anonymous namespace)::ExprRewriter, swift::Expr*, void, void, void, void, void>::visit(swift::Expr*) + 6622
9  swift                    0x000000010d313616 (anonymous namespace)::ExprWalker::walkToExprPost(swift::Expr*) + 22
10 swift                    0x000000010d45b00c swift::Expr::walk(swift::ASTWalker&) + 76
11 swift                    0x000000010d307f7a swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool) + 442
12 swift                    0x000000010d3985b0 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::Type, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 624
13 swift                    0x000000010d3fc41a swift::ASTVisitor<(anonymous namespace)::StmtChecker, void, swift::Stmt*, void, void, void, void>::visit(swift::Stmt*) + 490
14 swift                    0x000000010d3fb789 (anonymous namespace)::StmtChecker::typeCheckBody(swift::BraceStmt*&) + 25
15 swift                    0x000000010d3fa84f swift::TypeChecker::typeCheckFunctionBodyUntil(swift::FuncDecl*, swift::SourceLoc) + 415
16 swift                    0x000000010d3fa661 swift::TypeChecker::typeCheckAbstractFunctionBodyUntil(swift::AbstractFunctionDecl*, swift::SourceLoc) + 49
17 swift                    0x000000010d3fb38a swift::TypeChecker::typeCheckAbstractFunctionBody(swift::AbstractFunctionDecl*) + 138
18 swift                    0x000000010d38067c typeCheckFunctionsAndExternalDecls(swift::TypeChecker&) + 220
19 swift                    0x000000010d3814a9 swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int) + 1913
20 swift                    0x000000010d187cf5 swift::CompilerInstance::performSema() + 4357
21 swift                    0x000000010ccf750c performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&) + 748
22 swift                    0x000000010ccf6fc8 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2728
23 swift                    0x000000010ccf302f main + 2015
24 libdyld.dylib            0x00007fff8925d5c9 start + 1
25 libdyld.dylib            0x000000000000003c start + 1994009204
Stack dump:
0.	Program arguments: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c /Users/garth/Library/Playgrounds/CrashProject/CrashProject/ViewController.swift /Users/garth/Library/Playgrounds/CrashProject/Crash.swift -primary-file /Users/garth/Library/Playgrounds/CrashProject/CrashProject/AppDelegate.swift -target x86_64-apple-ios9.0 -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.0.sdk -I /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Products/Debug-iphonesimulator -F /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Products/Debug-iphonesimulator -enable-testing -g -module-cache-path /Users/garth/Library/Developer/Xcode/DerivedData/ModuleCache -serialize-debugging-options -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-generated-files.hmap -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-own-target-headers.hmap -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-all-target-headers.hmap -Xcc -iquote -Xcc /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/CrashProject-project-headers.hmap -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/DerivedSources/x86_64 -Xcc -I/Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -working-directory/Users/garth/Library/Playgrounds/CrashProject -emit-module-doc-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate~partial.swiftdoc -Onone -module-name CrashProject -emit-module-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate~partial.swiftmodule -serialize-diagnostics-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.dia -emit-dependencies-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.d -emit-reference-dependencies-path /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.swiftdeps -o /Users/garth/Library/Developer/Xcode/DerivedData/CrashProject-bnjcqkfgrzrcotekncrjohmfkkav/Build/Intermediates/CrashProject.build/Debug-iphonesimulator/CrashProject.build/Objects-normal/x86_64/AppDelegate.o 
1.	While type-checking 'application' at /Users/garth/Library/Playgrounds/CrashProject/CrashProject/AppDelegate.swift:17:5
2.	While type-checking expression at [/Users/garth/Library/Playgrounds/CrashProject/CrashProject/AppDelegate.swift:21:9 - line:21:43] RangeText="info("first part " + "second part")"