index/features: Simplify split_features() fn

crates/crates_io_index/features.rs

@@ -13,40 +13,37 @@ pub fn split_features(
 
     // First, we partition the features into two groups: those that use the new
     // features syntax (`features2`) and those that don't (`features`).
-    let (mut features, mut features2) =
-        features
-            .into_iter()
-            .partition::<FeaturesMap, _>(|(_k, vals)| {
-                !vals
-                    .iter()
-                    .any(|v| v.starts_with("dep:") || v.contains("?/"))
-            });
+    let (mut features, mut features2): (FeaturesMap, FeaturesMap) = features
+        .into_iter()
+        .partition(|(_k, vals)| !vals.iter().map(String::as_ref).any(has_features2_syntax));
 
     // Then, we recursively move features from `features` to `features2` if they
     // depend on features in `features2`.
     for i in (0..ITERATION_LIMIT).rev() {
         let split = features
             .into_iter()
-            .partition::<FeaturesMap, _>(|(_k, vals)| {
-                !vals.iter().any(|v| features2.contains_key(v))
-            });
+            .partition(|(_k, vals)| !vals.iter().any(|v| features2.contains_key(v)));
 
         features = split.0;
 
-        if !split.1.is_empty() {
-            features2.extend(split.1);
-
-            if i == 0 {
-                warn!("Iteration limit reached while splitting features!");
-            }
-        } else {
+        if split.1.is_empty() {
             break;
         }
+
+        features2.extend(split.1);
+
+        if i == 0 {
+            warn!("Iteration limit reached while splitting features!");
+        }
     }
 
     (features, features2)
 }
 
+fn has_features2_syntax(s: &str) -> bool {
+    s.starts_with("dep:") || s.contains("?/")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;