cmd(snip): explicit error

Author: csmoe

src/command.rs

@@ -352,10 +352,9 @@ fn set_crate_path(path: Option<String>) -> String {
 }
 
 fn snip(opts: SnipOpitons) -> Result<(), Error> {
-    let opt = opts.clone();
-    let module = wasm_snip::snip(opts.into())?;
+    let module = wasm_snip::snip(opts.clone().into())?;
 
-    if let Some(output) = opt.output {
+    if let Some(output) = opts.output {
         elements::serialize_to_file(output, module)?;
     } else {
         let stdout = ::std::io::stdout();

src/error.rs

@@ -216,19 +216,21 @@ impl From<toml::de::Error> for Error {
     }
 }
 
+/// wasm-snip occurs error when trying to print out the result.
 impl From<parity_wasm::elements::Error> for Error {
     fn from(error: parity_wasm::elements::Error) -> Self {
         Error::Cli {
-            message: format!("{}", "There was an output Error"),
+            message: "There was an wasm-snip output Error".to_owned(),
             stderr: format!("{}", error),
         }
     }
 }
 
+/// wasm-snip occurs error when working with inputs.
 impl From<failure::Error> for Error {
     fn from(error: failure::Error) -> Self {
         Error::Cli {
-            message: format!("{}", "There was an wasm-snip Error"),
+            message: "There was an wasm-snip Error".to_owned(),
             stderr: format!("{}", error),
         }
     }