Code for the compiler described in my blog
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#pragma once
#include <map>
#include <string>
#include <set>
#include <optional>
#include "graph.hpp"
#include "type.hpp"
struct type_env;
using type_env_ptr = std::shared_ptr<type_env>;
enum class visibility { global,local };
class type_env {
struct variable_data {
type_scheme_ptr type;
visibility vis;
std::optional<std::string> mangled_name;
: variable_data(nullptr, visibility::local, std::nullopt) {}
variable_data(type_scheme_ptr t, visibility v, std::optional<std::string> n)
: type(std::move(t)), vis(v), mangled_name(std::move(n)) {}
type_env_ptr parent;
std::map<std::string, variable_data> names;
std::map<std::string, type_ptr> type_names;
type_env(type_env_ptr p) : parent(std::move(p)) {}
type_env() : type_env(nullptr) {}
void find_free(const type_mgr& mgr, std::set<std::string>& into) const;
void find_free_except(const type_mgr& mgr, const group& avoid,
std::set<std::string>& into) const;
type_scheme_ptr lookup(const std::string& name) const;
bool is_global(const std::string& name) const;
void set_mangled_name(const std::string& name, const std::string& mangled);
const std::string& get_mangled_name(const std::string& name) const;
type_ptr lookup_type(const std::string& name) const;
void bind(const std::string& name, type_ptr t,
visibility v = visibility::local);
void bind(const std::string& name, type_scheme_ptr t,
visibility v = visibility::local);
void bind_type(const std::string& type_name, type_ptr t);
void generalize(const std::string& name, const group& grp, type_mgr& mgr);
type_env_ptr type_scope(type_env_ptr parent);