It seems like just about every time I try to use tab completion in the Swift REPL it blows up. Here's an example of it blowing up when I type just two characters: i and then TAB:
$ swift
Welcome to Apple Swift version 5.1 (swiftlang-1100.0.270.13 clang-1100.0.33.7).
Type :help for assistance.
1> i0 lldb 0x00000001014ab705 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1 lldb 0x00000001014aad77 llvm::sys::RunSignalHandlers() + 39
2 lldb 0x00000001014abd58 SignalHandler(int) + 264
3 libsystem_platform.dylib 0x00007fff7e309b5d _sigtramp + 29
4 libsystem_platform.dylib 000000000000000000 _sigtramp + 2177852608
5 LLDB 0x0000000101f621dd (anonymous namespace)::CodeCompletionCallbacksImpl::doneParsing() + 15469
6 LLDB 0x00000001027407ba swift::performDelayedParsing(swift::DeclContext*, swift::PersistentParserState&, swift::CodeCompletionCallbacksFactory*) + 458
7 LLDB 0x0000000101f8603e doCodeCompletion(swift::SourceFile&, llvm::StringRef, unsigned int*, swift::CodeCompletionCallbacksFactory*) + 494
8 LLDB 0x0000000101f85de1 swift::REPLCompletions::populate(swift::SourceFile&, llvm::StringRef) + 673
9 LLDB 0x00000001019c5029 lldb_private::SwiftREPL::CompleteCode(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, lldb_private::StringList&) + 569
10 LLDB 0x00000001017744a9 lldb_private::REPL::IOHandlerComplete(lldb_private::IOHandler&, char const*, char const*, char const*, int, int, lldb_private::StringList&, lldb_private::StringList&) + 489
11 LLDB 0x00000001016e8157 lldb_private::IOHandlerEditline::AutoCompleteCallback(char const*, char const*, char const*, int, int, lldb_private::StringList&, lldb_private::StringList&, void*) + 55
12 LLDB 0x000000010178b1fe lldb_private::Editline::TabCommand(int) + 110
13 LLDB 0x000000010178d531 lldb_private::Editline::ConfigureEditor(bool)::$_13::__invoke(editline*, int) + 33
14 libedit.3.dylib 0x00007fff7bc8974b el_wgets + 478
15 libedit.3.dylib 0x00007fff7bc9494b el_gets + 37
16 LLDB 0x000000010178cd1e lldb_private::Editline::GetLines(int, lldb_private::StringList&, bool&) + 446
17 LLDB 0x00000001016e8b03 lldb_private::IOHandlerEditline::Run() + 115
18 LLDB 0x00000001016cffdb lldb_private::Debugger::ExecuteIOHandlers() + 123
19 LLDB 0x00000001016d2a23 lldb_private::Debugger::IOHandlerThread(void*) + 19
20 LLDB 0x000000010177d2d7 lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*) + 103
21 libsystem_pthread.dylib 0x00007fff7e3122eb _pthread_body + 126
22 libsystem_pthread.dylib 0x00007fff7e315249 _pthread_start + 66
23 libsystem_pthread.dylib 0x00007fff7e31140d thread_start + 13
Segmentation fault: 11
$
Running on macOS 10.14.6, launched from Terminal.
Summary
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