complicated method chain

build.rs

@@ -27,12 +27,14 @@ lazy_static! {
     static ref PYTHON_INTERPRETER: &'static str = {
         ["python", "python3"]
             .iter()
-            .map(|bin| (bin, Command::new(bin).arg("--version").output()))
-            .filter(|(_, r)| r.is_ok())
-            .map(|(bin, r)| (bin, r.unwrap()))
+            .find(|bin| {
+                if let Ok(out) = Command::new(bin).arg("--version").output() {
                     // begin with `Python 3.X.X :: additional info`
-            .find(|(_, r)| r.stdout.starts_with(b"Python 3") || r.stderr.starts_with(b"Python 3"))
-            .map(|(bin, _)| bin)
+                    out.stdout.starts_with(b"Python 3") || out.stderr.starts_with(b"Python 3")
+                } else {
+                    false
+                }
+            })
             .expect("Python 3.x interpreter not found")
     };
 }