What do you mean? They do. They want to replace the name of the file with a number at compile time so that the logs are tiny. The way they do that now is that they pass __FILE__ to a char parameter pack expansion to generate a unique type that erases to nothing but a number at compile time and extract the unique id of that type using nm but that doesn’t work with source_location because it has char* as the type.

I wonder if there’s some kind of workaround where you wrap source_location so that it outputs the hash of the file name using a know consteval hashing function. Then you have your unique type (just assign the hash value to your type) at the cost of some extra overhead of needing to hash every filename in your build.