CLHS: Section 9.1.3.1.1

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## 9.1.3.1.1 Capitalization and Punctuation in Condition Reports

It is recommended that a report message be a complete sentences, in the proper case and correctly punctuated. In English, for example, this means the first letter should be uppercase, and there should be a trailing period.

     (error "This is a message")  ; Not recommended
     (error "this is a message.") ; Not recommended

     (error "This is a message.") ; Recommended instead

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