Fix explicit_iter_loop lint

```
cargo clippy --fix --workspace --exclude bindgen-integration --exclude tests_expectations -- -W clippy::explicit_iter_loop
```

Author: nyurik

bindgen/codegen/impl_partialeq.rs

@@ -23,7 +23,7 @@ pub(crate) fn gen_partialeq_impl(
             &self.bindgen_union_field[..] == &other.bindgen_union_field[..]
         });
     } else {
-        for base in comp_info.base_members().iter() {
+        for base in comp_info.base_members() {
             if !base.requires_storage(ctx) {
                 continue;
             }

bindgen/codegen/mod.rs

@@ -3653,7 +3653,7 @@ impl CodeGenerator for Enum {
                     DerivableTraits::EQ,
             );
             let mut derives: Vec<_> = derives.into();
-            for derive in item.annotations().derives().iter() {
+            for derive in item.annotations().derives() {
                 if !derives.contains(&derive.as_str()) {
                     derives.push(derive);
                 }
@@ -4944,7 +4944,7 @@ impl CodeGenerator for ObjCInterface {
             };
             result.push(struct_block);
             let mut protocol_set: HashSet<ItemId> = Default::default();
-            for protocol_id in self.conforms_to.iter() {
+            for protocol_id in &self.conforms_to {
                 protocol_set.insert(*protocol_id);
                 let protocol_name = ctx.rust_ident(
                     ctx.resolve_type(protocol_id.expect_type_id(ctx))
@@ -4989,7 +4989,7 @@ impl CodeGenerator for ObjCInterface {
                     }
                 };
                 result.push(impl_trait);
-                for protocol_id in parent.conforms_to.iter() {
+                for protocol_id in &parent.conforms_to {
                     if protocol_set.insert(*protocol_id) {
                         let protocol_name = ctx.rust_ident(
                             ctx.resolve_type(protocol_id.expect_type_id(ctx))

bindgen/ir/analysis/mod.rs

@@ -280,9 +280,9 @@ mod tests {
 
         fn reverse(&self) -> Graph {
             let mut reversed = Graph::default();
-            for (node, edges) in self.0.iter() {
+            for (node, edges) in &self.0 {
                 reversed.0.entry(*node).or_insert_with(Vec::new);
-                for referent in edges.iter() {
+                for referent in edges {
                     reversed
                         .0
                         .entry(*referent)
@@ -331,7 +331,7 @@ mod tests {
 
             let original_size = self.reachable.entry(node).or_default().len();
 
-            for sub_node in self.graph.0[&node].iter() {
+            for sub_node in &self.graph.0[&node] {
                 self.reachable.get_mut(&node).unwrap().insert(*sub_node);
 
                 let sub_reachable =
@@ -354,7 +354,7 @@ mod tests {
         where
             F: FnMut(Node),
         {
-            for dep in self.reversed.0[&node].iter() {
+            for dep in &self.reversed.0[&node] {
                 f(*dep);
             }
         }

bindgen/ir/analysis/template_params.rs

@@ -464,7 +464,7 @@ impl<'ctx> MonotoneFramework for UsedTemplateParameters<'ctx> {
             // (This is so that every item we call `constrain` on is guaranteed
             // to have a set of template parameters, and we can allow
             // blocklisted templates to use all of their parameters).
-            for item in allowlisted_items.iter() {
+            for item in &allowlisted_items {
                 extra_assert!(used.contains_key(item));
                 extra_assert!(dependencies.contains_key(item));
                 item.trace(

bindgen/ir/comp.rs

@@ -1162,14 +1162,14 @@ impl CompInfo {
         match self.fields {
             CompFields::Error => {}
             CompFields::After { ref fields, .. } => {
-                for field in fields.iter() {
+                for field in fields {
                     if let Some(layout) = field.layout(ctx) {
                         callback(layout);
                     }
                 }
             }
             CompFields::Before(ref raw_fields) => {
-                for field in raw_fields.iter() {
+                for field in raw_fields {
                     let field_ty = ctx.resolve_type(field.0.ty);
                     if let Some(layout) = field_ty.layout(ctx) {
                         callback(layout);
@@ -1672,7 +1672,7 @@ impl CompInfo {
     pub(crate) fn already_packed(&self, ctx: &BindgenContext) -> Option<bool> {
         let mut total_size: usize = 0;
 
-        for field in self.fields().iter() {
+        for field in self.fields() {
             let layout = field.layout(ctx)?;
 
             if layout.align != 0 && total_size % layout.align != 0 {

bindgen/ir/context.rs

@@ -2055,7 +2055,7 @@ If you encounter an error missing from this list, please file an issue or a PR!"
             let mut header_names_to_compile = Vec::new();
             let mut header_paths = Vec::new();
             let mut header_contents = String::new();
-            for input_header in self.options.input_headers.iter() {
+            for input_header in &self.options.input_headers {
                 let path = Path::new(input_header.as_ref());
                 if let Some(header_path) = path.parent() {
                     if header_path == Path::new("") {

bindgen/ir/objc.rs

@@ -301,7 +301,7 @@ impl ObjCMethod {
 
         // Get arguments without type signatures to pass to `msg_send!`
         let mut args_without_types = vec![];
-        for arg in args.iter() {
+        for arg in args {
             let arg = arg.to_string();
             let name_and_sig: Vec<&str> = arg.split(' ').collect();
             let name = name_and_sig[0];

bindgen/lib.rs

@@ -929,7 +929,7 @@ impl Bindings {
             )?;
         }
 
-        for line in self.options.raw_lines.iter() {
+        for line in &self.options.raw_lines {
             writer.write_all(line.as_bytes())?;
             writer.write_all(NL.as_bytes())?;
         }
@@ -1104,7 +1104,7 @@ fn parse(context: &mut BindgenContext) -> Result<(), BindgenError> {
     use clang_sys::*;
 
     let mut error = None;
-    for d in context.translation_unit().diags().iter() {
+    for d in &context.translation_unit().diags() {
         let msg = d.format();
         let is_err = d.severity() >= CXDiagnostic_Error;
         if is_err {

bindgen/options/mod.rs

@@ -1143,7 +1143,7 @@ options! {
         },
         as_args: |module_lines, args| {
             for (module, lines) in module_lines {
-                for line in lines.iter() {
+                for line in lines {
                     args.push("--module-raw-line".to_owned());
                     args.push(module.clone().into());
                     args.push(line.clone().into());

bindgen/regex_set.rs

@@ -128,7 +128,7 @@ impl RegexSet {
         if !matches.matched_any() {
             return false;
         }
-        for i in matches.iter() {
+        for i in &matches {
             self.matched[i].set(true);
         }