Nested and Named IF Constructs

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Nested and Named `IF` Constructs

All control constructs can be both named and nested.

    outa: IF (a .NE. 0) THEN
     x = b/a
     inna1: IF (c .NE. 0) THEN
      y = d/c
     ELSE inna1
      y = -99
     ENDIF inna1   
    ELSEIF (a .GT. 0) THEN outa
     ...
    ELSE outa
     ...
    ENDIF outa

The names may only be used once per program unit and are only intended to make the code clearer.

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