boxing_nan.h (mrb_float_p): wrap macro argument by parenthesis.
MODIFY
include/mruby/boxing_nan.h
include/mruby/boxing_nan.h
@@ -68,7 +68,7 @@ mrb_nan_boxing_value_float(mrb_value v)
r.u = float_uint_union.u + 0x8004000000000000; \
} while(0)
-#define mrb_float_p(o) (((uint64_t)(o.u)&0xfffc000000000000) != 0)
+#define mrb_float_p(o) (((uint64_t)((o).u)&0xfffc000000000000) != 0)
struct RInteger {
MRB_OBJECT_HEADER;

boxing_nan.h (mrb_float_p): wrap macro argument by parenthesis.