The Usage sample in README crashes when run in irb. about libui

[gemmaro]

I found a description of the timing of the parsing in "Rurema > 使用上の制限 > ローカル変数の宣言". (It may be an overlook, but I could not find this in the English documentation.)

I used it as a reference and was able to get it to start successfully by enclosing the entire code shown in Usage in begin to end.

However, there are still some concerns:

• irb method completion doesn't work because it is inside the begin block.
• It freezes when I press the close button of the window. (However, the window will disappear when irb is closed, so this is ok.)

Environment and Version

$ uname -mprsv
Darwin 20.2.0 Darwin Kernel Version 20.2.0: Wed Dec  2 20:39:59 PST 2020; root:xnu-7195.60.75~1/RELEASE_X86_64 x86_64 i386

$ ruby -v
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]

$ irb -v
irb 1.3.0 (2020-12-25)

[kojix2]

Thank you very much. The problem has been fixed.
The problem probably had something to do with garbage collection.
See #8 for more details.

After resolving issue 8, the sample on the top page now works.
(It still freezes after pressing the close button though).