Initial data commit

Task/Higher-order-functions/Modula-3/higher-order-functions.mod3

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+MODULE Proc EXPORTS Main;
+
+IMPORT IO;
+
+TYPE Proc = PROCEDURE();
+
+PROCEDURE Second() =
+  BEGIN
+    IO.Put("Second procedure.\n");
+  END Second;
+
+PROCEDURE First(proc: Proc) =
+  BEGIN
+    proc();
+  END First;
+
+BEGIN
+  First(Second);
+END Proc.