compiler/testData/repl/controlFlow/mutateVal.repl - third_party/github/JetBrains/kotlin - Git at Google

 >>> val x = 1
 >>> x = 2
 error: val cannot be reassigned
 x = 2
 ^
 >>> x++
 error: val cannot be reassigned
 x++
 ^
 >>> x
 1
	>>> val x = 1
	>>> x = 2
	error: val cannot be reassigned
	x = 2
	^
	>>> x++
	error: val cannot be reassigned
	x++
	^
	>>> x
	1