Fix stdweb extern issue (#66)

Cargo.toml

@@ -26,7 +26,7 @@ libc = "0.2.60"
 
 [target.wasm32-unknown-unknown.dependencies]
 wasm-bindgen = { version = "0.2.29", optional = true }
-stdweb = { version = "0.4.9", optional = true }
+stdweb = { version = "0.4.18", optional = true }
 
 [features]
 std = []

src/lib.rs

@@ -230,8 +230,6 @@ cfg_if! {
             if #[cfg(feature = "wasm-bindgen")] {
                 #[path = "wasm32_bindgen.rs"] mod imp;
             } else if #[cfg(feature = "stdweb")] {
-                // temp fix for stdweb
-                extern crate std;
                 #[path = "wasm32_stdweb.rs"] mod imp;
             } else {
                 #[path = "dummy.rs"] mod imp;

src/wasm32_stdweb.rs

@@ -7,6 +7,8 @@
 // except according to those terms.
 
 //! Implementation for WASM via stdweb
+extern crate std;
+
 use core::mem;
 
 use stdweb::unstable::TryInto;