use array instead of iter::once

Author: pvdrz

src/lib.rs

@@ -77,11 +77,11 @@ use crate::parse::{ClangItemParser, ParseError};
 use crate::regex_set::RegexSet;
 
 use std::borrow::Cow;
+use std::env;
 use std::fs::{File, OpenOptions};
 use std::io::{self, Write};
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
-use std::{env, iter};
 
 // Some convenient typedefs for a fast hash map and hash set.
 type HashMap<K, V> = ::rustc_hash::FxHashMap<K, V>;
@@ -1539,10 +1539,10 @@ impl Builder {
         self.options.input_header = self.input_headers.pop();
         self.options.extra_input_headers = self.input_headers;
         self.options.clang_args.extend(
-            self.options.extra_input_headers.iter().flat_map(|header| {
-                iter::once("-include".into())
-                    .chain(iter::once(header.to_string()))
-            }),
+            self.options
+                .extra_input_headers
+                .iter()
+                .flat_map(|header| ["-include".into(), header.to_string()]),
         );
 
         self.state.input_unsaved_files.extend(