Error due to calling a loop control command in an ineligible scope
class X::ControlFlow is Exception { }
Thrown when a control flow construct (such as next or redo) is called outside the dynamic scope of an enclosing construct that is supposed to catch them.
For example
last;
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: «X::ControlFlow: last without loop construct»
method illegal returns Str:D
Returns the name of the control flow command that was called.
method enclosing returns Str:D
Returns the name of the missing enclosing construct.