# Metaprogramming using eval and struct: BUG getting UndefVarError: not defined

**URL:** <https://discourse.julialang.org/t/metaprogramming-using-eval-and-struct-bug-getting-undefvarerror-not-defined/37937>\
**Category:** General Usage\
**Tags:** question, bug, eval, struct\
**Created:** [April 21, 2020, 12:23am UTC](https://discourse.julialang.org/t/metaprogramming-using-eval-and-struct-bug-getting-undefvarerror-not-defined/37937 "2020-04-21T00:23:17Z")\
**Posts on this page:** 1\
**Showing post:** 22

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**Author:** ![dpsanders](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dpsanders/32/3573_2.png) [@dpsanders](https://discourse.julialang.org/u/dpsanders)\
**Post date:** [April 30, 2020, 7:20am UTC](https://discourse.julialang.org/t/metaprogramming-using-eval-and-struct-bug-getting-undefvarerror-not-defined/37937/22 "2020-04-30T07:20:46Z")

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There was a recent discussion about that on Discourse:

[https://discourse.julialang.org/t/alternative-to-mutable-named-tuple/38375](https://discourse.julialang.org/t/alternative-to-mutable-named-tuple/38375)

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_[View the full topic](https://discourse.julialang.org/t/metaprogramming-using-eval-and-struct-bug-getting-undefvarerror-not-defined/37937)._