Port dom, fetch, guide-supported-types-examples, import_js examples to Rust 2018 edition

examples/dom/Cargo.toml

@@ -2,6 +2,7 @@
 name = "dom"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]

examples/dom/src/lib.rs

@@ -1,6 +1,3 @@
-extern crate wasm_bindgen;
-extern crate web_sys;
-
 use wasm_bindgen::prelude::*;
 
 // Called by our JS entry point to run the example

examples/fetch/Cargo.toml

@@ -2,6 +2,7 @@
 name = "fetch"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]
@@ -11,7 +12,7 @@ futures = "0.1.20"
 wasm-bindgen = { version = "0.2.29", features = ["serde-serialize"]  }
 js-sys = "0.3.6"
 wasm-bindgen-futures = "0.3.6"
-serde = "^1.0.59"
+serde = { version = "1.0.80", features = ["derive"] }
 serde_derive = "^1.0.59"
 
 [dependencies.web-sys]

examples/fetch/src/lib.rs

@@ -1,18 +1,11 @@
-extern crate futures;
-extern crate js_sys;
-extern crate wasm_bindgen;
-extern crate wasm_bindgen_futures;
-extern crate web_sys;
-#[macro_use]
-extern crate serde_derive;
-
 use futures::{future, Future};
 use js_sys::Promise;
 use wasm_bindgen::prelude::*;
 use wasm_bindgen::JsCast;
 use wasm_bindgen_futures::future_to_promise;
 use wasm_bindgen_futures::JsFuture;
 use web_sys::{Request, RequestInit, RequestMode, Response};
+use serde::{Deserialize, Serialize};
 
 /// A struct to hold some data from the github Branch API.
 ///

examples/guide-supported-types-examples/Cargo.toml

@@ -2,6 +2,7 @@
 name = "guide-supported-types-examples"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]

examples/guide-supported-types-examples/src/lib.rs

@@ -1,7 +1,5 @@
 #![allow(unused_variables, dead_code)]
 
-extern crate wasm_bindgen;
-
 pub mod bool;
 pub mod boxed_js_value_slice;
 pub mod boxed_number_slices;

examples/import_js/Cargo.toml

@@ -2,6 +2,7 @@
 name = "import_js"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]

examples/import_js/src/lib.rs

@@ -1,5 +1,3 @@
-extern crate wasm_bindgen;
-
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen(module = "./defined-in-js")]