WIP: Collection modules

samples/collections/Makefile

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+ASC=../../src/asc
+MODULE_NAME="\x1b[1;32mModule:\x1b[1;34m"
+BEGIN="\x1b[0;1mBegin...\x1b[0m"
+DONE="\x1b[1mDone.\n---------------------------------------------------\x1b[0m"
+
+.PHONY: default all clean
+
+default: all
+
+all: \
+	List.out \
+	ListTest.out \
+	Trie.out \
+	Set.out \
+	SetDb.out \
+	SetDbTest.out \
+	ProduceExchange.out \
+
+clean:
+	rm -f *.out
+
+List.out: list.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^ > $@
+	@echo $(DONE)
+
+ListTest.out: list.as listTest.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^ > $@
+	@echo $(DONE)
+
+Trie.out: list.as trie.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^  > $@
+	@echo $(DONE)
+
+Set.out: list.as trie.as set.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^ > $@
+	@echo $(DONE)
+
+SetDb.out: list.as trie.as set.as setDb.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^ > $@
+	@echo $(DONE)
+
+SetDbTest.out: list.as trie.as set.as setDb.as setDbTest.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^ > $@
+	@echo $(DONE)
+
+ProduceExchange.out: list.as trie.as produceExchange.as
+	@echo $(MODULE_NAME) $(basename $@)
+	@echo $(BEGIN)
+	$(ASC) -r $^ > $@
+	@echo $(DONE)

samples/collections/README.md

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+[See #127](https://github.com/dfinity-lab/actorscript/issues/127)
+
+Critical modules
+==================
+ - [x] **List**: See [`List` module from SML Basis library](http://sml-family.org/Basis/list.html).
+ - [x] **Hashtrie**: Persistent maps, as functional hash tries.
+ - [x] **Set**: Persistent sets, based directly on persistent maps.
+ - [ ] **Hashtable**: Mutable maps, as imperative hash tables.
+
+Secondary modules
+==================
+These modules _may_ be useful in the collections library:
+ - [ ] **Stream**: Type def done; most operations are pending...
+
+Other modules
+==================
+These modules are merely exercises (toys/examples), and _not_ essential to the collections library:
+ - [ ] **Thunk**: Type def and some operations are done.
+
+