# What is this error?

**URL:** <https://forum.makecode.com/t/what-is-this-error/44678>\
**Category:** Help\
**Tags:** javascript\
**Created:** [June 25, 2026, 11:56pm UTC](https://forum.makecode.com/t/what-is-this-error/44678 "2026-06-25T23:56:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![VoxelMaster64](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/voxelmaster64/32/32075_2.png) [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)\
**Post date:** [June 25, 2026, 11:56pm UTC](https://forum.makecode.com/t/what-is-this-error/44678/1 "2026-06-25T23:56:05Z")

</div>

I was trying to make a runtime error with the fewest characters, and `img(0)` confused me. It generates an error, but for whatever reason, the project still runs. The error is this: `!!proc || !bin.finalPass` and can be shown [here](https://arcade.makecode.com/S59205-50766-73618-58430). What does this mean?

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<div class="post-metadata">

**Author:** ![WoofWoof](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/woofwoof/32/32523_2.png) [@WoofWoof](https://forum.makecode.com/u/WoofWoof)\
**Post date:** [June 27, 2026, 2:46am UTC](https://forum.makecode.com/t/what-is-this-error/44678/2 "2026-06-27T02:46:39Z")

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Because the img`.` functionality is kinda a built in function mapping directly to a c++ function, it is probably just kinda skipped over and ignored even though it’s technically an error. My assumption would be that simply the JavaScript part of the editor doesn’t know or care that the c++ is erroring and just replaces the value with undefined and moves on:

 ![Screenshot 2026-06-26 at 8.51.32 PM](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/3X/f/8/f848827154e53ffd72b655f50b79c3dde477abfc.png)

If `control.fail("")` doesn’t fit your criteria, maybe `let f=()=>{f()};f()` will…

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<div class="post-metadata">

**Author:** ![VoxelMaster64](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/voxelmaster64/32/32075_2.png) [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)\
**Post date:** [August 6, 2026, 4:25pm UTC](https://forum.makecode.com/t/what-is-this-error/44678/3 "2026-08-06T16:25:36Z")

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the error also appears when doing

```typescript
declare function a(): any
a()

```