aprantl added a comment.
In this design the success_handlers return an exit status *and* set a string
error. We could unify this by having the handler return an llvm::Error
(https://llvm.org/doxygen/classllvm_1_1Error.html). When it is successful, it
returns Error::success, otherwise it returns
`llvm::make_error<llvm::StringError>("message", llvm::inconvertibleErrorCode)`.
In ReturnMIStatus we do something like
auto status = handler(...)
bool exit_status = MIstatus::success;
handleAllErrors(status.takeError(), [&](const StringError &error) {
his->SetError(error.getMessage();
exit_status = error_handler();
});
return exit_status;
https://reviews.llvm.org/D48295
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