I wrote the following code in a F# file and compiled it to DLL. Then I loaded it inside of a C# project. The first function, sum didn't show up at all. Whereas the second function, retint did. Both are valid F# functions, so I'm confused as to why the first function doesn't show up in the class browser in the C# project. It should be in the DLL because I can import NUnit inside of the F# project, write unit tests for sum and load the resulting DLL into NUnit.

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let rec sum xs = 
	match xs with 
	[] -> 0
	| x::xs' -> x + sum xs'
		let rec retint d = 
		match d with 
		1 -> 1
		| _ -> 2