Labels

A label is any word that is followed by a colon (with no space between the word and the colon) and is not in quotation marks. For example:

MYNAME:

A label marks the start of a subroutine. The following example shows one use of a label (called error) within a procedure:

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IF problem  = 'yes' then SIGNAL error
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error:
   SAY 'Problem in your data'
   EXIT