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§5.4.(a) General syntax for guards
A guard is declared using the keyword when
followed by a
boolean expression in parentheses:
when (predicateExpression)
Depending on the kind of guard different objects are in scope using
special identifiers like this
, base
.
Any predicate expression that evaluates to true
enables
the callin binding(s) to which it applies.
Evaluation to false
disables the callin binding(s).
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