add missing wasm runtime function (#29)

src/witness/witness_calculator.rs

@@ -82,6 +82,8 @@ impl WitnessCalculator {
                 "log" => runtime::log_component(store),
                 "exceptionHandler" => runtime::exception_handler(store),
                 "showSharedRWMemory" => runtime::show_memory(store),
+                "printErrorMessage" => runtime::print_error_message(store),
+                "writeBufferMessage" => runtime::write_buffer_message(store),
             }
         };
         let instance = Wasm::new(Instance::new(&module, &import_object)?);
@@ -333,6 +335,20 @@ mod runtime {
         Function::new_native(store, func)
     }
 
+    // Circom 2.0
+    pub fn print_error_message(store: &Store) -> Function {
+        #[allow(unused)]
+        fn func() {}
+        Function::new_native(store, func)
+    }
+    
+    // Circom 2.0
+    pub fn write_buffer_message(store: &Store) -> Function {
+        #[allow(unused)]
+        fn func() {}
+        Function::new_native(store, func)
+    }
+
     pub fn log_signal(store: &Store) -> Function {
         #[allow(unused)]
         fn func(a: i32, b: i32) {}