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+-- !!! cumulative re-exportation of class methods, pt 2.
+module M where
+
+import Mod159_D
+
+-- Mod159_D re-exports the class C using (..). C is defined
+-- in Mod159_A, but (only) two of its methods are visible
+-- in Mod159_D, one via Mod159_B, the other via Mod159_C.
+a = m1 'a'
+b = m2 'b'
+-- m3 isn't in scope
+c = m3 'c'