assert "1+1 equals 2" == "\{1}+\{1} equals \{1+1}"
one = 1
add x, y = x + y
assert "1+1 equals 2" == "\{one}+\{one} equals \{add one, one}"
assert "\nx\ny\n1\n2\n" == """
x
y
\{1}
\{2}
"""
bcd = "bcd"
abcde = """a\"\{bcd}\"e"""
assert abcde == "a\"bcd\"e"