Thank you for reporting a bug in Boa! This will make us improve the engine. But first, fill the following template so that we better understand what's happening. Feel free to add or remove sections as you feel appropriate.
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**Describe the bug**
A clear and concise description of what the bug is.
<!-- E.g.:
The variable statement is not working as expected, it always adds 10 when assigning a number to a variable"
-->
**To Reproduce**
Steps to reproduce the issue, or JavaScript code that causes this failure.
<!-- E.g.:
This JavaScript code reproduces the issue:
```javascript
var a = 10;
a;
```
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**Expected behavior**
Explain what you expected to happen, and what is happening instead.
<!-- E.g.:
Running this code, `a` should be set to `10` and printed, but `a` is instead set to `20`. The expected behaviour can be found in the [ECMAScript specification][spec].
