Not directly related to the Crystal compiler itself.
A library you use, seems it's scry, want to create a file superior to the 255 bytes limit (https://serverfault.com/questions/9546/filename-length-limits-on-linux#9548)
I think so, but not sure where to post.
You can post to https://github.com/crystal-lang-tools/scry/issues
In any case the compiler shouldn't say you found a bug, it should give a proper error message.
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In any case the compiler shouldn't say you found a bug, it should give a proper error message.