github.phpd.cn/thought-machine/please@v12.2.0+incompatible/src/parse/asp/test_data/interpreter/equality.build (about)

     1  # Bools are singletons so 'is' works as expected
     2  x = True
     3  y = True
     4  z = False
     5  
     6  a = x == y
     7  b = x is y
     8  c = x == z
     9  d = x is z
    10  
    11  # Ints aren't.
    12  x = 1
    13  y = 1
    14  z = 2
    15  
    16  e = x == y
    17  f = x is y
    18  g = x == z