Always store return value of AST node

Author: jaepil

monic/expressions/interpreter.py

@@ -251,8 +251,9 @@ def execute(self, tree: ast.AST) -> t.Any:
                         result = self.visit(stmt.value)
                         self.global_env["_"] = result
                     else:
-                        # For other statements, just execute them
-                        self.visit(stmt)
+                        # For other statements, execute them and possibly
+                        # return the result
+                        result = self.visit(stmt)
                 return result
             else:
                 result = self.visit(tree)