parsing prefix version (binary operators) of msph

example/ex1.msph

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+
+nominal C
+
+

example/ex2.msph

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+type A = & C D

example/ex3.msph

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+
+type X = & C (| D E)
+
+type Y = {
+	member x : X
+	type Z = & X {
+ 		type T = C
+		assert C <: D
+	}
+	member r : (box forall S. (=> S Y))
+	member s : C[X, Y, z]
+	member f : -> A B
+}