Use with_capacity(0) because we're reading the capacity later on

rust-lang · compiler-errors · Aug 19, 2022 · Oct 10, 2024 · Oct 10, 2024 · Nov 4, 2024
commit b62ee10e5448a077e67e46f6907a4a04415895a8
diff --git a/library/std/src/sys/pal/unix/os.rs b/library/std/src/sys/pal/unix/os.rs
@@ -706,7 +706,7 @@ pub fn page_size() -> usize {
 //     https://pubs.opengroup.org/onlinepubs/9699919799/functions/confstr.html
 #[cfg(target_vendor = "apple")]
 fn confstr(key: c_int, size_hint: Option<usize>) -> io::Result<OsString> {
-    let mut buf: Vec<u8> = Vec::new();
+    let mut buf: Vec<u8> = Vec::with_capacity(0);
     let mut bytes_needed_including_nul = size_hint
         .unwrap_or_else(|| {
             // Treat "None" as "do an extra call to get the length". In theory