If we go here there are some calls to validation like validateField #title nonEmpty. So what is # here? There is a postfix # which is used along with -XMagicHash extension but I can't find any info on prefix notation
What is # as prefix?
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1 Answers
While this may look like coming from -XMagicHash, this is actually an overloaded label. You can learn more about them in the GHC User Guide
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