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I have got an error message with next code
template< typename Type > int func( Type as, float fl=NAN );
error: #109: expression preceding parentheses of apparent call must have (pointer-to-) function type
It seems the problem is with resolving NAN, defined in math.h at line 249
# define NAN (__ESCAPE__(0f_7FC00000))
There is no problem if no NAN used
template< typename Type > int func( Type as, float fl=0 );
There is no problem if template not used
int func( int as, float fl=NAN );
There is no problem with GCC.
Compilier version
*** Using Compiler 'V5.05 update 2 (build 169)'
The problem appears to be that the C++ compiler does not recognize the (undocumented?) compiler intrinsic __ESCAPE__ early enough in the parsing process to decipher this expression.