Python

import sys, math 

assert False ** False == 1

assert False == False in [False]

assert type(1 ** 1) != type(1 ** -1)

# print(f"""{ "yep\nope" }""")  # ERROR?

assert round(0.5) == 0.0
assert round(1.5) == 2.0
assert round(2.5) == 2.0

y = (1 << 53) + 1
assert y + 1.0 < y

o = []
for i in range(99999): o.append(False)
assert sys.getsizeof(o) == 824456 or sys.getsizeof(o) == 824472
assert sys.getsizeof(False) == 24

x = []
x.append(x)
assert x[0][0][0][0][0][0][0][0][0][0][0] == x
assert x[-1][-1][-1][-1][-1][-1][-1][-1] == x

#anon = lambda x:          ERROR?   
#           if x > 0:
#               return 1
#           else: 
#               return 0

Nim

import math, strformat

assert not compiles(false ^ false == 1)

assert not(false == false in [false])

assert type(1 ^ 1) is type(1 ^ -1)

echo fmt"""{ "yep\nope" }"""

assert round(0.5) == 1.0
assert round(1.5) == 2.0
assert round(2.5) == 3.0

var y = (1 shl 53) + 1
assert not compiles(y + 1.0 < y)

var o: seq[bool]
for i in 0..99999: o.add false
assert sizeOf(o) == 8
assert sizeOf(false) == 1

var x: seq[int]
x.add(x)
assert not compiles(x[0][0][0][0][0][0][0][0][0][0][0] == x)
assert not compiles(x[^1][^1][^1][^1][^1][^1][^1][^1] == x)

var anon = (func (x: int): int =
             if x > 0:
               return 1
             else: 
               return 0
           )