# Unsure about properties

**URL:** <https://discourse.julialang.org/t/unsure-about-properties/110756>\
**Category:** General Usage\
**Tags:** properties\
**Created:** [February 26, 2024, 4:10am UTC](https://discourse.julialang.org/t/unsure-about-properties/110756 "2024-02-26T04:10:46Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Benny](https://avatars.discourse-cdn.com/v4/letter/b/49beb7/32.png) [@Benny](https://discourse.julialang.org/u/Benny)\
**Post date:** [February 26, 2024, 3:20pm UTC](https://discourse.julialang.org/t/unsure-about-properties/110756/11 "2024-02-26T15:20:37Z")

</div>

> [@mkitti](#):
>
> ```julia
> struct SType
> S::Type{S}
> end
> 
> ```

This throws `UndefVarError: S not defined`, field annotations unknowns must be from the type definition’s `where` clause.

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