Bump min Rust version

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
 language: rust
 rust:
-- nightly-2017-07-21
+- nightly-2017-09-05
 addons:
   apt:
     packages:
@@ -16,9 +16,9 @@ script:
 - |
   travis-cargo build -- --all-features --all &&
   travis-cargo test -- --all-features --all &&
-  travis-cargo --only nightly-2017-07-21 doc -- --no-deps --all-features --all
+  travis-cargo --only nightly-2017-09-05 doc -- --no-deps --all-features --all
 after_success:
-- travis-cargo --only nightly-2017-07-21 doc-upload
+- travis-cargo --only nightly-2017-09-05 doc-upload
 env:
   global:
   - TRAVIS_CARGO_NIGHTLY_FEATURE=""

build.rs

@@ -11,8 +11,8 @@ use version_check::{is_nightly, is_min_version, is_min_date};
 // Specifies the minimum nightly version that is targetted
 // Note that sometimes the `rustc` date might be older than the nightly version,
 // usually one day older
-const MIN_DATE: &'static str = "2017-07-20";
+const MIN_DATE: &'static str = "2017-09-04";
-const MIN_VERSION: &'static str = "1.20.0-nightly";
+const MIN_VERSION: &'static str = "1.22.0-nightly";
 
 // Convenience macro for writing to stderr.
 macro_rules! printerr {

rust-toolchain

@@ -1 +1 @@
-nightly-2017-07-21
+nightly-2017-09-05

src/lib.rs

@@ -1164,10 +1164,10 @@ impl Response {
             AllOrSome::Some(ref origin) => origin.origin().unicode_serialization(),
         };
 
-        response.set_raw_header("Access-Control-Allow-Origin", origin);
+        let _ = response.set_raw_header("Access-Control-Allow-Origin", origin);
 
         if self.allow_credentials {
-            response.set_raw_header("Access-Control-Allow-Credentials", "true");
+            let _ = response.set_raw_header("Access-Control-Allow-Credentials", "true");
         } else {
             response.remove_header("Access-Control-Allow-Credentials");
         }
@@ -1179,7 +1179,7 @@ impl Response {
                 .collect();
             let headers = headers.join(", ");
 
-            response.set_raw_header("Access-Control-Expose-Headers", headers);
+            let _ = response.set_raw_header("Access-Control-Expose-Headers", headers);
         } else {
             response.remove_header("Access-Control-Expose-Headers");
         }
@@ -1191,7 +1191,7 @@ impl Response {
                 .collect();
             let headers = headers.join(", ");
 
-            response.set_raw_header("Access-Control-Allow-Headers", headers);
+            let _ = response.set_raw_header("Access-Control-Allow-Headers", headers);
         } else {
             response.remove_header("Access-Control-Allow-Headers");
         }
@@ -1200,20 +1200,20 @@ impl Response {
             let methods: Vec<_> = self.allow_methods.iter().map(|m| m.as_str()).collect();
             let methods = methods.join(", ");
 
-            response.set_raw_header("Access-Control-Allow-Methods", methods);
+            let _ = response.set_raw_header("Access-Control-Allow-Methods", methods);
         } else {
             response.remove_header("Access-Control-Allow-Methods");
         }
 
         if self.max_age.is_some() {
             let max_age = self.max_age.unwrap();
-            response.set_raw_header("Access-Control-Max-Age", max_age.to_string());
+            let _ = response.set_raw_header("Access-Control-Max-Age", max_age.to_string());
         } else {
             response.remove_header("Access-Control-Max-Age");
         }
 
         if self.vary_origin {
-            response.set_raw_header("Vary", "Origin");
+            let _ = response.set_raw_header("Vary", "Origin");
         } else {
             response.remove_header("Vary");
         }