added assertion that n >= 0

2019-01-10 18:09:58 -06:00 · 2019-01-10 18:09:58 -06:00 · d2eca73482
parent 1c42a9daca
commit d2eca73482
1 changed files with 1 additions and 0 deletions
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@ -1097,6 +1097,7 @@ def integer_squareroot(n: int) -> int:
    """
    The largest integer ``x`` such that ``x**2`` is less than ``n``.
    """
+    assert n >= 0
    x = n
    y = (x + 1) // 2
    while y < x: