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+-- !!! cumulative re-exportation of data constructors, pt 2.
+module M where
+
+import Mod157_D
+
+-- Mod157_D re-exports the type T using (..). T is defined
+-- in Mod157_A, but (only) two of its constructors is visible
+-- in Mod157_D, one via Mod157_B, the other via Mod157_C.
+a = A
+b = B
+-- C is out of scope.
+c = C
+
+