Statement modifiers

The simple statements break, continue, exit, expression, print, return, throw, and yield may be modified with a statement modifier. There are two possible modifiers:

An If modifier affects the statement so that it will be evaluated only when the conditional expression evaluates to "true".

A While modifier affects the statement so that it will be evaluated in a loop as long as the conditional expression evaluates to "true".

  stmt-modifier := ( "if" exprcondition | "while" exprcondition ) 

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