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In 3.6.0 (git a653694 Fri Jun 20 14:16:47 EDT 2014),
I get "error CS0584: Internal compiler error: Object reference not set to an instance of an object"
static void Foo (string foo, params object  moreFoo)
static void Main (string  args)
When the params argument is removed from Foo, the compiler gives a correct error upon the invocation of Foo without the first argument. It NREs internally when params are present.
Fixed in master