isinf             164 include/ruby/missing.h #  define isinf(x) (!finite(x) && !isnan(x))
isinf              17 missing/erf.c  #   define isinf(x) (!_finite(x) && !_isnan(x))
isinf               9 missing/isinf.c isinf(double n)
isinf              37 missing/isinf.c isinf(double n)
isinf              56 missing/isinf.c isinf(double n)