CLHS: Section 9.1.3.1.2

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## 9.1.3.1.2 Leading and Trailing Newlines in Condition Reports

It is recommended that a report message not begin with any introductory text, such as ```Error:` '' or ```Warning:` '' or even just freshline or newline. Such text is added, if appropriate to the context, by the routine invoking the condition reporter.

It is recommended that a report message not be followed by a trailing freshline or newline. Such text is added, if appropriate to the context, by the routine invoking the condition reporter.

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