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Kevin Lozandier
Courses Plus Student 53,747 PointsImplicit Dictionaries and alternate explicit declarations not being recognized by Swift challenge requiring one
For some reason, a Swift challenge associated with dictionaries doesn't state it wants only a type annotated initialized dictionary; it doesn't accept an implicit declaration of a dictionary or the use of var caramelDelight: Dictionary.
The challenge accordingly only accepts:
struct ChocolateBox {
var caramelDelight: [String: String] = ["flavor": "caramel"]
}
If other two ways of successfully completing the challenge are explicitly being ignored/undesired, the error in preview is extremely misleading—particularly the rather surprisingly large error message in the preview plane I've never seen actually propagate inside Xcode.
It seems the challenge prompt needs to be changed accordingly; perhaps Pasan Premaratne can find time to chime in?
struct ChocolateBox {
var caramelDelight: [String: String] = ["flavor": "caramel"]
}
2 Answers
Pasan Premaratne
Treehouse TeacherCool thanks for the update. Your second answer should be valid, odd that it's not working. The first answer however, causes Xcode on my machine to basically explode lol. It is rightly invalid but we'll try returning a much better error message than what you got.
Pasan Premaratne
Treehouse TeacherWould you mind posting the sample code that generates the error along with the error message?
Kevin Lozandier
Courses Plus Student 53,747 PointsHey, Pasan:
The following was attempted instead (both in the code challenge and a Swift Playground to validate they were valid ways of satisfying the challeing:
struct ChocolateBox {
var caramelDelight: Dictionary = ["flavor": "caramel"]
}
or
struct ChocolateBox {
var caramelDelight = ["flavor": "caramel"]
}
The error I was provided by the challenge is a long dump:
0 swift 0x000000010336ca68 llvm::sys::PrintStackTrace(__sFILE*) + 40
1 swift 0x000000010336cf54 SignalHandler(int) + 452
2 libsystem_platform.dylib 0x00007fff8ce625aa _sigtramp + 26
3 libsystem_platform.dylib 0x00007fe15ad67240 _sigtramp + 3455077552
4 swift 0x0000000102770bab swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 9179
5 swift 0x00000001026ea110 swift::irgen::IRGenModule::emitGlobalTopLevel() + 208
6 swift 0x000000010275d8dc performIRGeneration(swift::IRGenOptions&, swift::Module*, swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, swift::SourceFile*, unsigned int) + 1900
7 swift 0x000000010275e2e3 swift::performIRGeneration(swift::IRGenOptions&, swift::SourceFile&, swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, unsigned int) + 51
8 swift 0x00000001026b35f4 frontend_main(llvm::ArrayRef, char const*, void*) + 5444
9 swift 0x00000001026b096d main + 1677
10 libdyld.dylib 0x00007fff946ca5fd start + 1
Stack dump:
0. Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file swift_lint.swift -target x86_64-apple-darwin13.4.0 -target-cpu core2 -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -module-name my_program_lint_build -o /var/folders/4y/79d26rz52wq84ksknz2h86fm0000zn/T/swift_lint-46ca90.o
1. While emitting IR SIL function @_TFV21my_program_lint_build12ChocolateBoxCfMS0_FT14caramelDelightVSs10Dictionary_S0_ for 'init' at swift_lint.swift:3:8
:0: error: unable to execute command: Segmentation fault: 11
:0: error: swift frontend command failed due to signal (use -v to see invocation)
Kevin Lozandier
Courses Plus Student 53,747 PointsKevin Lozandier
Courses Plus Student 53,747 PointsHey, Pasan:
Understood; it's odd the first answer causes XCode on your machine to explode. On my version of Xcode (6.1.1), it works fine.