In a C++ program I'd written data - complex<long real> to a file: 
(66.184415158223105773,-0.00037139050691640109188) (nan,0) (nan,0) (nan,nan)
(nan,0) (66.184390020754110227,0.00076665851805737529283)
(66.201451462903545667,0.0097865244553575969136)
(66.273663243057493816,0.011598247090358962108)
(65.35171132660672394,-0.03138479279043892791) and so on.
All written values are as expected.

Reading back these data I get:
(66.1844,-0.000371391) (0,0) (6.97431e-3261,0) (6.97431e-3261,0)
(6.97431e-3261,0)
and so on (exception: the first number after a line change is always read to
(7.72947e-3833,0) )

There's no error message - it acts like a correct read


-- 
           Summary: reading complex (nan,0) and (nan,nan): write o.k,
                    reading back: wrong data read
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kohlhz at t-online dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45279

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