Fix use of wrong environment for name mangling.

code/compiler/13/compiler.cpp

@@ -54,7 +54,7 @@ void compiler::translate() {
     }
     for(auto& defn : global_defs.defs_defn) {
         auto& function = defn.second->into_global(global_scp);
-        global_env->set_mangled_name(defn.first, function.name);
+        defn.second->env->set_mangled_name(defn.first, function.name);
     }
 }
 

content/blog/13_compiler_cleanup/index.md

@@ -1,8 +1,8 @@
 ---
-title: Compiling a Functional Language Using C++, Part 13 - More Improvements
+title: Compiling a Functional Language Using C++, Part 13 - Cleanup
 date: 2020-09-10T18:50:02-07:00
 tags: ["C and C++", "Functional Languages", "Compilers"]
-description: "In this post, we clean up our compiler and add some basic optimizations."
+description: "In this post, we clean up our compiler."
 ---
 
 In [part 12]({{< relref "12_compiler_let_in_lambda" >}}), we added `let/in`
@@ -809,9 +809,10 @@ And here's what it is now:
 
 {{< codelines "C++" "compiler/13/compiler.cpp" 55 58 >}}
 
-We always declare the `definition_defn` function in
-the `global_env`. Thus, that's the only environment
-we need to know about to update the mangled name.
+Rather than traversing the chain of environments from
+the body of the definition, we just use the definition's 
+own `env_ptr`. This is cleaner and more explicit, and
+it helps us not use the private members of `type_env`!
 
 The deal with `env` is about as simple. We just make
 it and its two descendants classes, and mark their