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-rw-r--r--internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 3b091e503e..05f4b537fc 100644
--- a/internal.h
+++ b/internal.h
@@ -121,6 +121,7 @@ VALUE rb_integer_float_cmp(VALUE x, VALUE y);
VALUE rb_integer_float_eq(VALUE x, VALUE y);
size_t rb_absint_size(VALUE val, int *number_of_leading_zero_bits);
size_t rb_absint_size_in_word(VALUE val, size_t word_numbits, size_t *number_of_leading_zero_bits);
+int rb_absint_singlebit_p(VALUE val);
/* class.c */
VALUE rb_obj_methods(int argc, VALUE *argv, VALUE obj);