Claude Code uses Bun written in Rust now

Re:Claude Code uses Bun written in Rust now by mort96 on Sunday July 19, 2026 @09:25AM (#48968040)

What makes you think it's a segfault? Does your shell print "Segmentation fault"? If so, you should be back at your shell and you should be able to recover the tab by typing 'reset' + enter (even if you can't see anything as you're typing it).

If nothing prints "Segmentation fault", this just sounds like a hang

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Re:Claude Code uses Bun written in Rust now by javawizard on Sunday July 19, 2026 @01:58PM (#48970273)

I just had this happen today. It was indeed a segfault.

From what I could tell it looked like it was in JS code that had been JIT compiled. I haven't attempted to troubleshoot further beyond setting all my future Claude Code instances to pipe their stderr to disk so that I don't lose the stack trace next time.

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Re:Claude Code uses Bun written in Rust now by kccqzy on Sunday July 19, 2026 @05:26PM (#48971798)

Bun does not have its own JIT compiler. Bun uses JSC made by Apple. So your blame should be directed to Apple.

And I can believe you because I’ve seen JavaScript-heavy Safari tabs crash.

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