# Using @code\_warntype to inspect my module functions
**URL:** https://discourse.julialang.org/t/using-code-warntype-to-inspect-my-module-functions/74901
**Category:** General Usage
**Created:** [January 20, 2022, 4:42am UTC](https://discourse.julialang.org/t/using-code-warntype-to-inspect-my-module-functions/74901 "2022-01-20T04:42:51Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)
#### Post date: [January 20, 2022, 4:42am UTC](https://discourse.julialang.org/t/using-code-warntype-to-inspect-my-module-functions/74901/1 "2022-01-20T04:42:51Z")
Hello!
I am wondering what or how is the best way to use `@code_warntype` to inspect my code for type instabilities. To give you some context, I am working in a script file (`.jl`) and doing `using MyCustomModule` at the top to bring in some structs and methods I have written. Also, I am using VsCode with the Julia extension.
I want to step through the methods I have defined and try to find places where I might have created type instabilities. What I have tried thus far to do is have a line like this in my script (not all methods are exported) and run it interactively by highlighting it and pressing Shift+Enter. The output is sent to the REPL. .
```julia
@code_warntype MyCustomModule.SomeMethod
```
Regardless of which method I use the macro on though, I seem to only ever get back the following (below) and I assume I must be doing something wrong.
```julia
Variables
#self#::Core.Const(getproperty)
x::Module
f::Symbol
Body::Any
1 ─ %1 = Base.getfield(x, f)::Any
└── return %1
```
I would appreciate any tips on how I could use this correctly.
---
### Author:  [@jzr](https://discourse.julialang.org/u/jzr)
#### Post date: [January 20, 2022, 4:46am UTC](https://discourse.julialang.org/t/using-code-warntype-to-inspect-my-module-functions/74901/2 "2022-01-20T04:46:29Z")
You have to call the function. `@code_warntype foo(1,2)`. Also you might want to try `JET.@report_opt f(1,2)`.
---
### Author:  [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)
#### Post date: [January 21, 2022, 12:58am UTC](https://discourse.julialang.org/t/using-code-warntype-to-inspect-my-module-functions/74901/3 "2022-01-21T00:58:59Z")
> [@jzr](#):
>
> You have to call the function. `@code_warntype foo(1,2)` . Also you might want to try `JET.@report_opt f(1,2)` .
Ah okay - Thank you, and also I did not know about `JET.jl`. I will definitely check that out.
So my problem now is that some of my functions are nested in other functions. I was hoping I could enter the top function via the debugger and then run `@code_warntype NestedFunction(Inputs)` from the debugger console while inside my top level function but that doesn’t seem to work.
---
### Author:  [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)
#### Post date: [January 21, 2022, 1:13am UTC](https://discourse.julialang.org/t/using-code-warntype-to-inspect-my-module-functions/74901/4 "2022-01-21T01:13:09Z")
Actually I take that back. At least for the function I am currently trying, `@code_warntype` seems to evaluate fine but it returns nothing. I wonder if that means my function is too complex.