array-indexing.md

@@ -37,3 +37,26 @@ Also unambiguous, but inconsistent with the use of `[]` for lists.
 This doesn't even require any new syntax, because `.#` is a valid infix operator.
 
 
+## Use of '!'
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+A more useful definition of '!' would be
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+f ! x = x `seq` f x
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+where '!' has the exact same fixity as function application. so 
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+foo !x !y
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+could be used to call foo with x and y evaluated strictly beforehand.
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+