Open Radar

 
Summary:
Having defined a C struct in BridgingHeader.h with the following structure:
struct info_type {
    int priority;
};

And then attempting to modify the memory pointed by an unsafe pointer like this:
class ViewController: UIViewController {
    func viewDidLoad() {
        var info = info_type()
        info.priority = 2    
        processInfo(&info)
    }

    func processInfo(infoRef: UnsafePointer<info_type>) {
        info.memory.priority = 1
    }
}

will cause the Xcode parser to fail.

Steps to Reproduce:
1. Create a new Swift project
2. Add a bridging header file
3. Add the following code to the bridging header:
struct info_type {
    int priority;
};
4. Replace the ViewController class with the following:
class ViewController: UIViewController {
    override func viewDidLoad() {
        var info = info_type()
        info.priority = 2    
        processInfo(&info)
    }

    func processInfo(infoRef: UnsafePointer<info_type>) {
        info.memory.priority = 1
    }
}

Expected Results:
Xcode should notify the user that the memory for the struct pointed by infoRef cannot be modified because it's an UnsafePointer and that an UnsafeMutablePointer should be used.

Actual Results:
Xcode shows a problem (red exclamation mark) in the issues tab and stops parsing the code in the project. The problem is the following:

Assertion failed: (GetSetInfo.getInt().hasValue()), function getSetterAccessibility, file /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-700.0.42.3/src/swift/include/swift/AST/Decl.h, line 4070.
0  swift                    0x0000000110340b9b llvm::sys::PrintStackTrace(__sFILE*) + 43
1  swift                    0x00000001103412db SignalHandler(int) + 379
2  libsystem_platform.dylib 0x00007fff8eaacf1a _sigtramp + 26
3  libsystem_platform.dylib 0x00007fff518bbbec _sigtramp + 3269520620
4  libsystem_c.dylib        0x00007fff8ef73b53 abort + 129
5  libsystem_c.dylib        0x00007fff8ef3bc39 basename + 0
6  swift                    0x000000010eafb1a0 void filterForDiscriminator<swift::ValueDecl*>(llvm::SmallVectorImpl<swift::ValueDecl*>&, swift::DebuggerClient*) + 0
7  swift                    0x000000010e950e0c diagnoseSubElementFailure(swift::Expr*, swift::SourceLoc, swift::constraints::ConstraintSystem&, swift::Diag<llvm::StringRef>, swift::Diag<swift::Type>) + 668
8  swift                    0x000000010e9b6908 swift::constraints::ConstraintSystem::computeAssignDestType(swift::Expr*, swift::SourceLoc) + 968
9  swift                    0x000000010e95ab65 swift::ASTVisitor<(anonymous namespace)::ConstraintGenerator, swift::Type, void, void, void, void, void>::visit(swift::Expr*) + 9317
10 swift                    0x000000010e95d58b (anonymous namespace)::ConstraintWalker::walkToExprPost(swift::Expr*) + 75
11 swift                    0x000000010ea72f1c swift::Expr::walk(swift::ASTWalker&) + 76
12 swift                    0x000000010e958219 swift::constraints::ConstraintSystem::generateConstraints(swift::Expr*) + 201
13 swift                    0x000000010e9afdbb swift::TypeChecker::solveForExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::Type, bool, swift::FreeTypeVariableBinding, swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem&, llvm::SmallVectorImpl<swift::constraints::Solution>&) + 203
14 swift                    0x000000010e9b56f3 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::Type, bool, swift::FreeTypeVariableBinding, swift::ExprTypeCheckListener*) + 243
15 swift                    0x000000010ea16cbb swift::ASTVisitor<(anonymous namespace)::StmtChecker, void, swift::Stmt*, void, void, void, void>::visit(swift::Stmt*) + 491
16 swift                    0x000000010ea15fd9 (anonymous namespace)::StmtChecker::typeCheckBody(swift::BraceStmt*&) + 25
17 swift                    0x000000010ea1509f swift::TypeChecker::typeCheckFunctionBodyUntil(swift::FuncDecl*, swift::SourceLoc) + 415
18 swift                    0x000000010ea14eb1 swift::TypeChecker::typeCheckAbstractFunctionBodyUntil(swift::AbstractFunctionDecl*, swift::SourceLoc) + 49
[...]