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[perl #123502] isnan identifier can't be used as a var
cl -c -nologo -GF -W3 -I..\lib\CORE -I.\include -I. -I.. -DWIN32 -D_CONS
OLE -DNO_STRICT -DPERLDLL -DPERL_CORE -O1 -MD -Zi -DNDEBUG -G7 -GL -DPERL_EXTE
RNAL_GLOB -DPERL_IS_MINIPERL -Fo.\mini\pp_sys.obj ..\pp_sys.c
pp_sys.c
..\pp_sys.c(4610) : error C2063: '_isnan' : not a function
NMAKE : fatal error U1077: 'cl' : return code '0x2'
See RT ticket for details.