Keep string alive

Author: lucic71

cpp2rust/rule_preprocessing/cpp_rule_indexer.cpp

@@ -323,7 +323,8 @@ llvm::json::Object ReadJson(const fs::path &path) {
 }
 
 unsigned SinceStandard(const fs::path &src_path) {
-  llvm::StringRef stem = src_path.stem().string();
+  auto stem_string = src_path.stem().string();
+  llvm::StringRef stem = stem_string;
   unsigned standard = 11;
   if (stem.consume_front("src_cxx") && stem.getAsInteger(10, standard)) {
     llvm::errs() << "ERROR: unexpected rule file " << src_path.string() << '\n';

cpp2rust/rule_preprocessing/cpp_rule_preprocessor.cpp

@@ -1134,10 +1134,10 @@ int main(int argc, char *argv[]) {
   for (const auto &path : paths) {
     llvm::errs() << "Preprocessing " << path.string() << '\n';
     llvm::SmallVector<llvm::StringRef, 4> file_flags(cxx_flags);
+    auto stem = path.stem().string();
     std::string standard_flag;
-    if (llvm::StringRef stem = path.stem().string();
-        stem.consume_front("src_cxx")) {
-      standard_flag = "-std=c++" + stem.str();
+    if (llvm::StringRef standard = stem; standard.consume_front("src_cxx")) {
+      standard_flag = "-std=c++" + standard.str();
       file_flags.push_back(standard_flag);
     }
     llvm::json::Object file_root;