# @run fib(5) makes Julia to crash in Julia 1.11 rc2

**URL:** <https://discourse.julialang.org/t/run-fib-5-makes-julia-to-crash-in-julia-1-11-rc2/118329>\
**Category:** VS Code\
**Created:** [August 18, 2024, 9:56am UTC](https://discourse.julialang.org/t/run-fib-5-makes-julia-to-crash-in-julia-1-11-rc2/118329 "2024-08-18T09:56:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sylvaticus](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sylvaticus/32/203883_2.png) [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Post date:** [August 18, 2024, 9:56am UTC](https://discourse.julialang.org/t/run-fib-5-makes-julia-to-crash-in-julia-1-11-rc2/118329/1 "2024-08-18T09:56:03Z")

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Making debug of this in VSCode Julia extension / Julia v1.11 RC2 makes Julia to crash. It works fine in Julia 1.10 or if breakpoints are used.

```julia
function fib(n)
    if n == 0 return 0 end
    if n == 1 return 1 end
    return fib(n-1) + fib(n-2)
end

@run fib(5)

```

Some error stack appears but it disappears too quick to be able for me to copy it.

Julia extension 1.105.2

EDIT

No, it crashes also in Julia v1.10, but I am pretty sure months ago it was working, so perhaps it is an upgrade to the Julia extension ???

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<div class="post-metadata">

**Author:** ![sylvaticus](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sylvaticus/32/203883_2.png) [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Post date:** [August 18, 2024, 10:04am UTC](https://discourse.julialang.org/t/run-fib-5-makes-julia-to-crash-in-julia-1-11-rc2/118329/2 "2024-08-18T10:04:18Z")

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Here the error screenshot from a video:

 ![image](https://global.discourse-cdn.com/julialang/original/3X/8/e/8ee3f5578a89f610d2b3bfcbe08f45ab0deb35c5.jpeg)

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<div class="post-metadata">

**Author:** ![mohamed.d180](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mohamed.d180/32/52028_2.png) [@mohamed.d180](https://discourse.julialang.org/u/mohamed.d180)\
**Post date:** [August 18, 2024, 11:41am UTC](https://discourse.julialang.org/t/run-fib-5-makes-julia-to-crash-in-julia-1-11-rc2/118329/3 "2024-08-18T11:41:19Z")

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There is an issue about some thing you mention, It is about `@run` macro in [Julia REPL crashes after @run debugging · Issue #3673 · julia-vscode/julia-vscode · GitHub](https://github.com/julia-vscode/julia-vscode/issues/3673) and fixed with [Fix terminate sequence](https://github.com/julia-vscode/DebugAdapter.jl/pull/89).  
So you can try some thing great like [Debugger.jl](https://juliahub.com/ui/Packages/General/Debugger) until the repository update.