# Compile time: we can't find any impls for this multi dispatch fn?

**URL:** <https://discourse.julialang.org/t/compile-time-we-cant-find-any-impls-for-this-multi-dispatch-fn/94736>\
**Category:** General Usage\
**Created:** [February 16, 2023, 7:22pm UTC](https://discourse.julialang.org/t/compile-time-we-cant-find-any-impls-for-this-multi-dispatch-fn/94736 "2023-02-16T19:22:06Z")\
**Posts on this page:** 1\
**Showing post:** 23

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**Author:** ![tim.holy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tim.holy/32/52_2.png) [@tim.holy](https://discourse.julialang.org/u/tim.holy)\
**Post date:** [February 19, 2023, 12:41pm UTC](https://discourse.julialang.org/t/compile-time-we-cant-find-any-impls-for-this-multi-dispatch-fn/94736/23 "2023-02-19T12:41:39Z")

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I think @jling is proposing that you don’t have to: unlike Scala, Julia is capable of updating code in the middle of a running session. See [Developer reference · Revise.jl](https://timholy.github.io/Revise.jl/stable/dev_reference/#Revise.add_callback) and consider checking out Genie.jl, which I believe already implements all this for you.

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