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The Wire · Showcase

BOOTSNAP PATCHES RUBY PARSER BUG; RAILS FIXES SPRING TEST WORKER SLOWDOWN

By RepoJournal · Filed · About Rails

Bootsnap shipped v1.24.3 to work around a critical Ruby parser bug that breaks compilation, while Rails eliminated a performance regression in forked test processes that was triggering unnecessary filesystem scans.

Bootsnap hit a nasty snag with Ruby's `RubyVM::InstructionSequence.compile_file` — it's using the wrong parser entirely [1]. The workaround was to switch to `.compile_file_prism`, but that method itself has a bug that ignores compile options, so the team had to patch both [2]. To make matters worse, file encoding defaults to the system locale, which breaks parsing on minimal Ruby setups where `LANG` isn't set [3]. Version 1.24.3 fixes both issues and forces UTF-8 parsing [4]. On the Rails side, a subtle memory leak was hiding in the test infrastructure: when Spring workers forked and cleared reloaders, the `ViewReloader` hook persisted and kept triggering expensive `Dir.[]` and `File.mtime` scans on every `prepend_view_path` call [5]. The fix deactivates the hook properly on reloader cleanup [6], which should restore Spring test performance for anyone running into this.

Action items

References

  1. [1] Workaround Ruby [Bug #22023] ↗ rails/bootsnap
  2. [2] Merge pull request #540 from byroot/use-proper-parser rails/bootsnap
  3. [3] Fix encoding in Ruby [Bug #22023] workaround rails/bootsnap
  4. [4] v1.24.3 ↗ rails/bootsnap
  5. [5] Deactivate ViewReloader hooks when reloaders are cleared ↗ rails/rails
  6. [6] Merge pull request #57285 from ariens/deactivate-view-reloader-hooks rails/rails

FAQ

What changed in Rails on May 5, 2026?
Bootsnap shipped v1.24.3 to work around a critical Ruby parser bug that breaks compilation, while Rails eliminated a performance regression in forked test processes that was triggering unnecessary filesystem scans.
What should Rails teams do about it?
Upgrade bootsnap to 1.24.3 immediately if you're on 1.24.2 or hit parse errors • Pull the ViewReloader fix into your Rails version if you run Spring tests • Monitor Spring test performance after both upgrades
Which Rails repositories shipped on May 5, 2026?
rails/bootsnap, rails/rails

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