8 Statements [stmt]

8.8 Jump statements [stmt.jump]

8.8.2 The break statement [stmt.break]

A break statement shall be enclosed by ([stmt.pre]) an iteration-statement ([stmt.iter]), an expansion-statement ([stmt.expand]), or a switch statement ([stmt.switch]).
The break statement causes termination of the innermost such enclosing statement; control passes to the statement following the terminated statement, if any.