module exports and name mangling

compiler/test2.nub

@@ -1,10 +1,10 @@
 module test
 
-struct person {
+export packed struct person {
     age: i32
     name: string
 }
 
-func do_something(name: string): i32 {
+export func do_something(name: string): i32 {
     return 3
 }