remove panic for wrong file data

src/error.rs

@@ -14,6 +14,8 @@ pub enum ErrorKind {
     IO(std::io::Error),
     #[fail(display = "verify error {}", _0)]
     VerifyFailure(String),
+    #[fail(display = "wrong file data {}", _0)]
+    WrongFileData(String),
     #[fail(
         display = "wrong name of Mercurial user '{}'.
 Must be in form 'Username <[email protected]>'.

src/lib.rs

@@ -635,7 +635,11 @@ impl<'a> MercurialRepo<'a> {
                     writeln!(output, "\ndata {}", data.len())?;
                     output.write_all(&data[..])?;
                 }
-                _ => panic!("Wrong file data!"),
+                _ => {
+                    return Err(ErrorKind::WrongFileData(
+                        String::from_utf8_lossy(&file.path).into(),
+                    ))
+                }
             }
         }