crate_config now returns a plain Error.

src/error.rs

@@ -27,10 +27,10 @@ impl Error {
         }
     }
 
-    pub fn crate_config(message: &str) -> Result<(), Self> {
-        Err(Error::CrateConfig {
+    pub fn crate_config(message: &str) -> Self {
+        Error::CrateConfig {
             message: message.to_string(),
-        })
+        }
     }
 
     pub fn error_type(&self) -> String {

src/manifest.rs

@@ -154,16 +154,19 @@ pub fn get_wasm_bindgen_version(path: &str) -> Result<String, Error> {
         .and_then(|deps| deps.wasm_bindgen)
     {
         Some(ref version) if version.is_empty() => {
-            let message = "\"wasm-bindgen\" dependency is missing its version number".to_string();
-            let e = Error::CrateConfig { message };
+            let msg = format!(
+                "\"{}\" dependency is missing its version number",
+                style("wasm-bindgen").bold().dim()
+            );
+            let e = Error::crate_config(&msg);
             Err(e)
         }
         Some(version) => Ok(version),
         None => {
-            let message = format!(
+            let msg = format!(
                 "Ensure that you have \"{}\" as a dependency in your Cargo.toml file:\n[dependencies]\nwasm-bindgen = \"0.2\"",
                 style("wasm-bindgen").bold().dim());
-            let e = Error::CrateConfig { message };
+            let e = Error::crate_config(&msg);
             Err(e)
         }
     }
@@ -187,9 +190,10 @@ fn check_crate_type(path: &str) -> Result<(), Error> {
         lib.crate_type
             .map_or(false, |types| types.iter().any(|s| s == "cdylib"))
     }) {
-        return Ok(());
+        Ok(())
+    } else {
+        let msg = "crate-type must be cdylib to compile to wasm32-unknown-unknown. Add the following to your Cargo.toml file:\n\n[lib]\ncrate-type = [\"cdylib\"]";
+        let e = Error::crate_config(msg);
+        Err(e)
     }
-    Error::crate_config(
-      "crate-type must be cdylib to compile to wasm32-unknown-unknown. Add the following to your Cargo.toml file:\n\n[lib]\ncrate-type = [\"cdylib\"]"
-    )
 }