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O\I
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O\I (Output\Infinite, name intentionally mirrored "I/O") is a simple esolang invented by User:None1 to simulate the result of any non-interactive I/O program.
Syntax
!text
Prints the text.
Other programs are Infinite loops.
Examples
Hello, world!
!Hello, world!
Infinite loop
fuck
Quine
It's impossible to construct a nonempty quine in this esolang.
Interpreter
Python
import sys x=sys.stdin.read() if x and x[0]=='!': print(x[1:]) else: while 1: pass
Computational class
Though this esolang is not Turing complete, for every non-interactive program with given input, there exists a program in this esolang that can't be distinguished from.