The generator fails to compute the destination path since std won't n…

…ormalize "file.rs/../directory".

This patch only removes the "file.rs" before normalization.

protocol_codegen/src/generate_messages.rs

@@ -16,8 +16,8 @@ use tempfile::tempdir;
 pub fn run() -> Result<(), Error> {
  let input_tmpdir = tempdir()?.into_path();
 
- let mut dir = std::fs::canonicalize(std::file!())?;
- dir.push("../../../src/messages");
+ let mut dir = std::fs::canonicalize(std::file!().rsplit_once("/").unwrap().0)?;
+ dir.push("../../src/messages");
  let output_path = std::fs::canonicalize(dir)?;
  let output_path = output_path.to_str().unwrap();