diff --git a/src/librustc_target/spec/mod.rs b/src/librustc_target/spec/mod.rs
index a1b997482608..91fd3f8e18ed 100644
--- a/src/librustc_target/spec/mod.rs
+++ b/src/librustc_target/spec/mod.rs
@@ -309,24 +309,14 @@ macro_rules! supported_targets {
         }
 
         #[cfg(test)]
-        mod test_json_encode_decode {
-            use rustc_serialize::json::ToJson;
-            use super::Target;
-            $(use super::$module;)+
+        mod tests {
+            mod tests_impl;
 
+            // Cannot put this into a separate file without duplication, make an exception.
             $(
-                #[test] // `#[test]` - this is hard to put into a separate file, make an exception
+                #[test] // `#[test]`
                 fn $module() {
-                    // Grab the TargetResult struct. If we successfully retrieved
-                    // a Target, then the test JSON encoding/decoding can run for this
-                    // Target on this testing platform (i.e., checking the iOS targets
-                    // only on a Mac test platform).
-                    let _ = $module::target().map(|original| {
-                        original.check_consistency();
-                        let as_json = original.to_json();
-                        let parsed = Target::from_json(as_json).unwrap();
-                        assert_eq!(original, parsed);
-                    });
+                    tests_impl::test_target(super::$module::target());
                 }
             )+
         }
@@ -1289,34 +1279,6 @@ impl Target {
             }
         }
     }
-
-    #[cfg(test)]
-    fn check_consistency(&self) {
-        // Check that LLD with the given flavor is treated identically to the linker it emulates.
-        // If you target really needs to deviate from the rules below, whitelist it
-        // and document the reasons.
-        assert_eq!(
-            self.linker_flavor == LinkerFlavor::Msvc
-                || self.linker_flavor == LinkerFlavor::Lld(LldFlavor::Link),
-            self.options.lld_flavor == LldFlavor::Link,
-        );
-        for args in &[
-            &self.options.pre_link_args,
-            &self.options.pre_link_args_crt,
-            &self.options.late_link_args,
-            &self.options.late_link_args_dynamic,
-            &self.options.late_link_args_static,
-            &self.options.post_link_args,
-        ] {
-            assert_eq!(
-                args.get(&LinkerFlavor::Msvc),
-                args.get(&LinkerFlavor::Lld(LldFlavor::Link)),
-            );
-            if args.contains_key(&LinkerFlavor::Msvc) {
-                assert_eq!(self.options.lld_flavor, LldFlavor::Link);
-            }
-        }
-    }
 }
 
 impl ToJson for Target {
diff --git a/src/librustc_target/spec/tests/tests_impl.rs b/src/librustc_target/spec/tests/tests_impl.rs
new file mode 100644
index 000000000000..4cf186bdd7c1
--- /dev/null
+++ b/src/librustc_target/spec/tests/tests_impl.rs
@@ -0,0 +1,43 @@
+use super::super::*;
+
+pub(super) fn test_target(target: TargetResult) {
+    // Grab the TargetResult struct. If we successfully retrieved
+    // a Target, then the test JSON encoding/decoding can run for this
+    // Target on this testing platform (i.e., checking the iOS targets
+    // only on a Mac test platform).
+    if let Ok(original) = target {
+        original.check_consistency();
+        let as_json = original.to_json();
+        let parsed = Target::from_json(as_json).unwrap();
+        assert_eq!(original, parsed);
+    }
+}
+
+impl Target {
+    fn check_consistency(&self) {
+        // Check that LLD with the given flavor is treated identically to the linker it emulates.
+        // If you target really needs to deviate from the rules below, whitelist it
+        // and document the reasons.
+        assert_eq!(
+            self.linker_flavor == LinkerFlavor::Msvc
+                || self.linker_flavor == LinkerFlavor::Lld(LldFlavor::Link),
+            self.options.lld_flavor == LldFlavor::Link,
+        );
+        for args in &[
+            &self.options.pre_link_args,
+            &self.options.pre_link_args_crt,
+            &self.options.late_link_args,
+            &self.options.late_link_args_dynamic,
+            &self.options.late_link_args_static,
+            &self.options.post_link_args,
+        ] {
+            assert_eq!(
+                args.get(&LinkerFlavor::Msvc),
+                args.get(&LinkerFlavor::Lld(LldFlavor::Link)),
+            );
+            if args.contains_key(&LinkerFlavor::Msvc) {
+                assert_eq!(self.options.lld_flavor, LldFlavor::Link);
+            }
+        }
+    }
+}