Merge pull request #1101 from andrehjr/port-rust-2018-edition-examples-v1

Port examples: add, canvas, char and hello_world to rust 2018 edition examples

examples/add/Cargo.toml

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

examples/add/src/lib.rs

@@ -1,5 +1,3 @@
-extern crate wasm_bindgen;
-
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]

examples/canvas/Cargo.toml

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

examples/canvas/src/lib.rs

@@ -1,7 +1,3 @@
-extern crate js_sys;
-extern crate wasm_bindgen;
-extern crate web_sys;
-
 use std::f64;
 use wasm_bindgen::prelude::*;
 use wasm_bindgen::JsCast;

examples/char/Cargo.toml

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

examples/char/src/lib.rs

@@ -1,5 +1,3 @@
-extern crate wasm_bindgen;
-
 use wasm_bindgen::prelude::*;
 
 // lifted from the `console_log` example

examples/hello_world/Cargo.toml

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

examples/hello_world/src/lib.rs

@@ -1,5 +1,3 @@
-extern crate wasm_bindgen;
-
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]