struct MovieContextMenu {
  // RUN: %refactor --convert-to-async -dump-rewritten -source-filename %s -pos=%(line + 1):10
  func onAddToWishlist(isIn: Bool, dispatch: (RemoveFromWishlist) -> Void) {
    if true {
      dispatch(RemoveFromWishlist())
    } else {
      dispatch(RemoveFromWishlist())
    }
  }
}

struct RemoveFromWishlist {}

Assertion failed: (Walker && "Not walking!"), function getWalker, file /Users/alex/swift-src/swift/include/swift/IDE/SourceEntityWalker.h, line 183.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump:
0.  Program arguments: /Users/alex/swift-src/nbuild/Release+Asserts/bin/swift-refactor --convert-to-async -dump-rewritten -source-filename /Users/alex/swift-src/swift/test/refactoring/test.swift -pos=3:10
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-refactor           0x000000010f6e5dc7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 39
1  swift-refactor           0x000000010f6e4be8 llvm::sys::RunSignalHandlers() + 248
2  swift-refactor           0x000000010f6e63f6 SignalHandler(int) + 262
3  libsystem_platform.dylib 0x00007fff20365d7d _sigtramp + 29
4  libsystem_platform.dylib 000000000000000000 _sigtramp + 18446603339975729824
5  libsystem_c.dylib        0x00007fff20275411 abort + 120
6  libsystem_c.dylib        0x00007fff202747e8 err + 0
7  swift-refactor           0x000000010f739ca3 std::__1::__function::__func<(anonymous namespace)::asyncrefactorings::AsyncConverter::walkToExprPre(swift::Expr*)::'lambda1'(), std::__1::allocator<(anonymous namespace)::asyncrefactorings::AsyncConverter::walkToExprPre(swift::Expr*)::'lambda1'()>, void ()>::operator()() (.cold.1) + 35
8  swift-refactor           0x000000010ad910d7 std::__1::__function::__func<(anonymous namespace)::asyncrefactorings::AsyncConverter::walkToExprPre(swift::Expr*)::'lambda1'(), std::__1::allocator<(anonymous namespace)::asyncrefactorings::AsyncConverter::walkToExprPre(swift::Expr*)::'lambda1'()>, void ()>::operator()() + 471
9  swift-refactor           0x000000010ad8ddd6 (anonymous namespace)::asyncrefactorings::AsyncConverter::walkToExprPre(swift::Expr*) + 1334
10 swift-refactor           0x000000010adb2a18 (anonymous namespace)::SemaAnnotator::walkToExprPre(swift::Expr*) + 232
11 swift-refactor           0x000000010bc8d939 swift::ASTVisitor<(anonymous namespace)::Traversal, swift::Expr*, swift::Stmt*, bool, swift::Pattern*, bool, void>::visit(swift::Stmt*) + 169
12 swift-refactor           0x000000010bc8e2df swift::ASTVisitor<(anonymous namespace)::Traversal, swift::Expr*, swift::Stmt*, bool, swift::Pattern*, bool, void>::visit(swift::Stmt*) + 2639
13 swift-refactor           0x000000010bc8d9ff swift::ASTVisitor<(anonymous namespace)::Traversal, swift::Expr*, swift::Stmt*, bool, swift::Pattern*, bool, void>::visit(swift::Stmt*) + 367
14 swift-refactor           0x000000010bc8ac47 swift::Stmt::walk(swift::ASTWalker&) + 87
15 swift-refactor           0x000000010adb21e6 swift::SourceEntityWalker::walk(swift::Stmt*) + 278
16 swift-refactor           0x000000010ad914be (anonymous namespace)::asyncrefactorings::AsyncConverter::convertNode(swift::ASTNode, swift::SourceLoc, bool) + 206
17 swift-refactor           0x000000010ad8cd72 (anonymous namespace)::asyncrefactorings::AsyncConverter::convert() + 130
18 swift-refactor           0x000000010ad7c7a8 (anonymous namespace)::RefactoringActionConvertToAsync::performChange() + 120
19 swift-refactor           0x000000010ad77130 swift::ide::refactorSwiftModule(swift::ModuleDecl*, swift::ide::RefactoringOptions, swift::ide::SourceEditConsumer&, swift::DiagnosticConsumer&) + 2672
20 swift-refactor           0x000000010ad0df81 main + 3649
21 libdyld.dylib            0x00007fff2033bf3d start + 1
/Users/alex/swift-src/nbuild/Release+Asserts/tools/swift/test-macosx-x86_64/refactoring/Output/test.swift.script: line 1: 35757 Abort trap: 6           /Users/alex/swift-src/nbuild/Release+Asserts/bin/swift-refactor --convert-to-async -dump-rewritten -source-filename /Users/alex/swift-src/swift/test/refactoring/test.swift -pos=3:10