chore: Use std::span for include paths in preprocessor

Signed-off-by: Roberto Raggi <[email protected]>

Author: robertoraggi

src/parser/cxx/preprocessor.cc

@@ -1050,15 +1050,15 @@ struct Preprocessor::Private {
 
     [[nodiscard]] auto userHeaderSearchPaths() -> SearchPaths {
       std::vector<std::span<const std::string>> paths;
-      paths.push_back(currentPaths);
-      paths.push_back(d->quoteIncludePaths_);
-      paths.push_back(d->systemIncludePaths_);
+      paths.push_back(std::span(currentPaths));
+      paths.push_back(std::span(d->quoteIncludePaths_));
+      paths.push_back(std::span(d->systemIncludePaths_));
       return paths;
     }
 
     [[nodiscard]] auto systemHeaderSearchPaths() -> SearchPaths {
       std::vector<std::span<const std::string>> paths;
-      paths.push_back(d->systemIncludePaths_);
+      paths.push_back(std::span(d->systemIncludePaths_));
       return paths;
     }