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You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#use-built-in-spans

Notice: Ensure you have installed Rust nightly. If you haven't installed it yet, please first see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust, then see https://rust-lang.github.io/rustup/concepts/channels.html to learn how to install Rust nightly.

or load it into the REPL:
https://rollup-3e2a0vtmx-rollup-js.vercel.app/repl/?pr=5529

Performance report!

Rough benchmark

Internal benchmark

• BUILD: 8315ms, 752 MB
  • initialize: 0ms, 26.1 MB
  • generate module graph: 3188ms, 575 MB
    • generate ast: 1554ms (+35ms, +2.3%), 567 MB
  • sort and bind modules: 459ms, 614 MB
  • mark included statements: 4682ms, 752 MB
    • treeshaking pass 1: 1573ms, 718 MB
    • treeshaking pass 2: 759ms, 736 MB
    • treeshaking pass 3: 302ms, 749 MB
    • treeshaking pass 4: 280ms, 744 MB
    • treeshaking pass 5: 327ms, 750 MB
    • treeshaking pass 6: 269ms, 747 MB
    • treeshaking pass 7: 250ms, 749 MB
    • treeshaking pass 8: 242ms, 748 MB
    • treeshaking pass 9: 222ms, 758 MB
    • treeshaking pass 10: 224ms, 756 MB
    • treeshaking pass 11: 222ms, 752 MB
• GENERATE: 888ms, 1.02 GB
  • initialize render: 0ms, 913 MB
  • generate chunks: 81ms, 925 MB
    • optimize chunks: 0ms, 920 MB
  • render chunks: 789ms, 998 MB
  • transform chunks: 16ms, 1.02 GB
  • generate bundle: 0ms, 1.02 GB

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.81%. Comparing base (7d8f3b3) to head (f699171).

@@           Coverage Diff           @@
##           master    #5529   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files         238      238           
  Lines        9544     9544           
  Branches     2439     2439           
=======================================
  Hits         9431     9431           
  Misses         48       48           
  Partials       65       65           

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This PR has been released as part of rollup@4.18.1. You can test it via npm install rollup.