# Why has subtypes function been moved to module InteractiveUtils? (v0.7.0)

**URL:** <https://discourse.julialang.org/t/why-has-subtypes-function-been-moved-to-module-interactiveutils-v0-7-0/11975>\
**Category:** General Usage\
**Created:** [June 26, 2018, 5:54pm UTC](https://discourse.julialang.org/t/why-has-subtypes-function-been-moved-to-module-interactiveutils-v0-7-0/11975 "2018-06-26T17:54:39Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**Author:** ![StefanKarpinski](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stefankarpinski/32/24_2.png) [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)\
**Post date:** [June 26, 2018, 7:02pm UTC](https://discourse.julialang.org/t/why-has-subtypes-function-been-moved-to-module-interactiveutils-v0-7-0/11975/6 "2018-06-26T19:02:25Z")

</div>

Supertype is an immediate and unchangeable property of a type. Subtypes is not like that at all: the entire type graph has to be walked to compute it and it changes any time someone defines a new subtype. Any code that’s using it in a way that’s not just exploratory is fairly suspect.

---

_[View the full topic](https://discourse.julialang.org/t/why-has-subtypes-function-been-moved-to-module-interactiveutils-v0-7-0/11975)._