partial rollback, might still not work

stdlib/adt_lower.krak

@@ -0,0 +1,33 @@
+import symbol:*
+import tree:*
+import vector:*
+import map:*
+import util:*
+import string:*
+import mem:*
+import io:*
+import ast_nodes:*
+import ast_transformation:*
+
+import pass_common:*
+
+fun adt_lower(name_ast_map: *map<string, pair<*tree<symbol>,*ast_node>>, ast_to_syntax: *map<*ast_node, *tree<symbol>>) {
+    name_ast_map->for_each(fun(name: string, syntax_ast_pair: pair<*tree<symbol>,*ast_node>) {
+        var helper_before = fun(node: *ast_node, parent_chain: *stack<*ast_node>) {
+            match(*node) {
+                ast_node::adt_def(backing) {
+                    println(backing.name + ": entered!")
+                }
+            }
+        }
+        var helper_after = fun(node: *ast_node, parent_chain: *stack<*ast_node>) {
+            match(*node) {
+                ast_node::adt_def(backing) {
+                    println(backing.name + ": exited!")
+                }
+            }
+        }
+        run_on_tree(helper_before, helper_after, syntax_ast_pair.second)
+    })
+}
+