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This article is from the FAQ, by with numerous contributions by others.

L02.4) Labelled imperatives

Labelled imperatives were previously defined in the language in two forms:

L: Imp;

and

(L: Imp1; ...; :L)

The second form has now been removed from the language. Instead, the
compiler offers the form

L: (# do Imp1; ... #)

Note that this form is implemented very efficiently in the case where there
are no declarations in the object descriptor (i.e. between (# and do).

 

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