Initial implementation if ugc, see #16; Fix tests

tests/compiler/reexport.ts

@@ -1,8 +1,25 @@
-export { add, renamed_sub, a as renamed_a, renamed_b as rerenamed_b } from "./export";
+export {
+  add,
+  sub as renamed_sub,
+  renamed_mul,
+  renamed_mul as rerenamed_mul,
 
-import { add as imported_add, renamed_sub as imported_sub, ns as imported_ns } from "./export";
+  a,
+  b as renamed_b,
+  renamed_c,
+  renamed_c as rerenamed_c
+} from "./export";
 
-export { imported_add as renamed_add, imported_sub as rerenamed_sub };
+import {
+  add as imported_add,
+  renamed_mul as imported_sub,
+  ns as imported_ns
+} from "./export";
+
+export {
+  imported_add as renamed_add,
+  imported_sub as rerenamed_sub
+};
 
 imported_add(1, 2) + imported_sub(3, 4);