notes towards an ast-validator

janet/validate.janet

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+### A validator for a Ludus AST
+
+(comment
+
+Tracking here, before I start writing this code, the kinds of validation we're hoping to accomplish:
+
+* splats come at the end of list, tuple, and dict patterns
+* no unbound names
+* no re-bound names
+* correct imports
+* no unbound names with `use` forms
+* no circular imports
+* first-level property access with pkg, e.g. `Foo :bar`--bar must be on Foo
+
+)