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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.//!  This example shows you how to define ops in Rust and then call them from//!  JavaScript.
use deno_core::Extension;use deno_core::JsRuntime;use deno_core::RuntimeOptions;
fn main() {  let my_ext = Extension::builder()    .middleware(|op| match op.name {      "op_print" => op.disable(),      _ => op,    })    .build();
  // Initialize a runtime instance  let mut runtime = JsRuntime::new(RuntimeOptions {    extensions: vec![my_ext],    ..Default::default()  });
  // Deno.core.print() will now be a NOP  runtime    .execute_script("<usage>", r#"Deno.core.print("I'm broken")"#)    .unwrap();}