1 class LoadedByParamClass {};
2 struct ParamClass {
3   LoadedByParamClass some_func();
4 };
5 struct SomeClass {
6   // LLDB stops in the constructor and then requests
7   // possible expression completions. This will iterate over the
8   // declarations in the translation unit.
9   // The unnamed ParamClass parameter causes that LLDB will add
10   // an incomplete ParamClass decl to the translation unit which
11   // the code completion will find. Upon inspecting the ParamClass
12   // decl to see if it can be used to provide any useful completions,
13   // Clang will complete it and load all its members.
14   // This causes that its member function some_func is loaded which in turn
15   // loads the LoadedByParamClass decl. When LoadedByParamClass
16   // is created it will be added to the translation unit which
17   // will invalidate all iterators that currently iterate over
18   // the translation unit. The iterator we use for code completion
19   // is now invalidated and LLDB crashes.
20   SomeClass(ParamClass) {}
21 };
22 int main() { ParamClass e; SomeClass y(e); }
23