Using the following Fortran file:

      block data bdata
      implicit double precision(a-h,o-z)
      common /a_common/a
      data a /1/
      end

with doxygen 1.7.3, running:

doxygen -g
doxygen

results in:

Preprocessing /home/andy/doxygen/test.f...
Prepassing fixed form of /home/andy/doxygen/test.f
Parsing file /home/andy/doxygen/test.f...
parse error in end <scopename>********************************************************************
Error in file /home/andy/doxygen/test.f line: 5, state: 6
********************************************************************

The problem did not occur with Doxygen 1.7.2.

The problem can be avoided by replacing the last line with:

      end block data

but this is not necessary in Fortran 77.