问题描述:
Write a python function to set the left most unset bit.

测试用例:
['assert set_left_most_unset_bit(10) == 14', 'assert set_left_most_unset_bit(12) == 14', 'assert set_left_most_unset_bit(15) == 15']

生成的代码:
def set_left_most_unset_bit(n):
    # Find the position of the leftmost unset bit
    position = 0
    while n & (1 << position):
        position += 1
    
    # Set that bit
    n |= (1 << position)
    
    return n

# Test cases
assert set_left_most_unset_bit(10) == 14
assert set_left_most_unset_bit(12) == 14
assert set_left_most_unset_bit(15) == 15