[dishmaker]

Before:

quote$ cargo llvm-lines --release | head -n 3
  Lines               Copies             Function name
  -----               ------             -------------
  8959                447                (TOTAL)

After:

quote$ cargo llvm-lines --release | head -n 3
  Lines               Copies             Function name
  -----               ------             -------------
  8495                424                (TOTAL)

[dishmaker]

Weird. On latest master total lines actually increased.

quote$ git log
commit 1253e2919ee22d51c94b61494c7e2de9e9392a3c (HEAD -> master, origin/master, origin/HEAD)
Merge: 6280f98 be59ab1
Author: David Tolnay <dtolnay@gmail.com>
Date:   Mon Nov 3 13:05:13 2025 -0800

    Merge pull request #308 from dishmaker/dishmaker/perf_llvml_runtime_append_arr
    
    perf: reduce llvm-lines by removing `.extend([_; 2])`

quote$ cargo llvm-lines --release | head -n 3
  Lines               Copies             Function name
  -----               ------             -------------
  8658                365                (TOTAL)

quote$ cargo -V
cargo 1.93.0-nightly (636800288 2025-10-31)

[dtolnay]

Related to <TokenStream as TokenStreamExt>::append from #305.

// 8662 lines

do_append(self, token.into());
fn do_append(stream: &mut TokenStream, tree: TokenTree) {
    stream.extend(Some(tree));
}

// 8672 lines

do_append(self, token.into());
fn do_append(stream: &mut TokenStream, tree: TokenTree) {
    stream.extend(iter::once(tree));
}

// 7768 lines

self.extend(iter::once(token.into()));

// 9376 lines

self.extend(Some(token.into()));