Narrowing works

src/typechecker/typechecker.hpp

@@ -18,6 +18,7 @@ namespace Solstice {
     class TypeChecker {
         std::unordered_map<std::string, PossibleType> variables;
         std::unordered_map<std::string, Type> types;
+        std::unordered_map<std::string, Function> functions;
 
         std::unordered_map<TypePair, Type> addOverloads;
         std::unordered_map<TypePair, Type> subtractOverloads;
@@ -80,5 +81,13 @@ namespace Solstice {
         }
 
         void checkTypes();
+
+        const Function* getFunction(const std::string& name) const {
+            auto it = functions.find(name);
+            if (it == functions.end()) {
+                return nullptr;
+            }
+            return &it->second;
+        }
     };
 }