DataError: Remove unused error variant

This was added due to Threadpool::spawn returning errors, but its
no longer used.

podcasts-data/Cargo.toml

@@ -20,8 +20,6 @@ futures = "0.1.23"
 hyper = "0.11.27"
 tokio = "0.1.8"
 tokio-core = "0.1.17"
-tokio-threadpool = "0.1.6"
-tokio-executor = "0.1"
 hyper-tls = "0.1.3"
 native-tls = "0.1.5"
 num_cpus = "1.8.0"

podcasts-data/src/errors.rs

@@ -4,7 +4,6 @@ use diesel_migrations::RunMigrationsError;
 use hyper;
 use native_tls;
 use rss;
-use tokio_executor;
 use url;
 use xml;
 
@@ -47,8 +46,6 @@ pub enum DataError {
     R2D2PoolError(#[cause] r2d2::PoolError),
     #[fail(display = "Hyper Error: {}", _0)]
     HyperError(#[cause] hyper::Error),
-    #[fail(display = "Tokio Spawn Error: {}", _0)]
-    SpawnError(#[cause] tokio_executor::SpawnError),
     #[fail(display = "Failed to parse a url: {}", _0)]
     UrlError(#[cause] url::ParseError),
     #[fail(display = "TLS Error: {}", _0)]
@@ -104,12 +101,6 @@ impl From<hyper::Error> for DataError {
     }
 }
 
-impl From<tokio_executor::SpawnError> for DataError {
-    fn from(err: tokio_executor::SpawnError) -> Self {
-        DataError::SpawnError(err)
-    }
-}
-
 impl From<url::ParseError> for DataError {
     fn from(err: url::ParseError) -> Self {
         DataError::UrlError(err)

podcasts-data/src/lib.rs

@@ -84,8 +84,6 @@ extern crate rfc822_sanitizer;
 extern crate rss;
 extern crate tokio;
 extern crate tokio_core;
-extern crate tokio_executor;
-extern crate tokio_threadpool;
 extern crate url;
 extern crate xdg;
 extern crate xml;