remove unused variable in compiletest

src/compiletest/compiletest.rs

@@ -126,12 +126,6 @@ fn make_absolute(path: PathBuf) -> PathBuf {
         }
     }
 
-    let filter = if !matches.free.is_empty() {
-        Some(matches.free[0].clone())
-    } else {
-        None
-    };
-
     Config {
         compile_lib_path: make_absolute(opt_path(matches, "compile-lib-path")),
         run_lib_path: make_absolute(opt_path(matches, "run-lib-path")),