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#include "env.hpp"
type_ptr type_env::lookup(const std::string& name) const {
auto it = names.find(name);
if(it != names.end()) return it->second;
if(parent) return parent->lookup(name);
return nullptr;
void type_env::bind(const std::string& name, type_ptr t) {
names[name] = t;
type_env type_env::scope() const {
return type_env(this);