Fix some some duplicate words.

src/bootstrap/build/job.rs

@@ -54,7 +54,7 @@ pub unsafe fn setup() {
 
     // Indicate that when all handles to the job object are gone that all
     // process in the object should be killed. Note that this includes our
-    // entire process tree by default because we've added ourselves and and our
+    // entire process tree by default because we've added ourselves and our
     // children will reside in the job by default.
     let mut info = mem::zeroed::<JOBOBJECT_EXTENDED_LIMIT_INFORMATION>();
     info.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;

src/librustc/session/config.rs

@@ -1355,7 +1355,7 @@ pub mod nightly_options {
                     early_error(ErrorOutputType::default(), &msg);
                 }
                 OptionStability::UnstableButNotReally => {
-                    let msg = format!("the option `{}` is is unstable and should \
+                    let msg = format!("the option `{}` is unstable and should \
                                        only be used on the nightly compiler, but \
                                        it is currently accepted for backwards \
                                        compatibility; this will soon change, \

src/librustc/traits/project.rs

@@ -40,7 +40,7 @@ use std::rc::Rc;
 pub enum ProjectionMode {
     /// FIXME (#32205)
     /// At coherence-checking time, we're still constructing the
-    /// specialization graph, and thus we only project project
+    /// specialization graph, and thus we only project
     /// non-`default` associated types that are defined directly in
     /// the applicable impl. (This behavior should be improved over
     /// time, to allow for successful projections modulo cycles

src/librustc/ty/trait_def.rs

@@ -176,7 +176,7 @@ impl<'tcx> TraitDef<'tcx> {
     /// Records a trait-to-implementation mapping for a non-local impl.
     ///
     /// The `parent_impl` is the immediately-less-specialized impl, or the
-    /// trait's def ID if the impl is is not a specialization -- information that
+    /// trait's def ID if the impl is not a specialization -- information that
     /// should be pulled from the metadata.
     pub fn record_remote_impl(&self,
                               tcx: &TyCtxt<'tcx>,

src/librustc/ty/wf.rs

@@ -268,7 +268,7 @@ impl<'a,'tcx> WfPredicates<'a,'tcx> {
     /// into `self.out`.
     fn compute_projection(&mut self, data: ty::ProjectionTy<'tcx>) {
         // A projection is well-formed if (a) the trait ref itself is
-        // WF WF and (b) the trait-ref holds.  (It may also be
+        // WF and (b) the trait-ref holds.  (It may also be
         // normalizable and be WF that way.)
 
         self.compute_trait_ref(&data.trait_ref);

src/librustc_trans/intrinsic.rs

@@ -1327,7 +1327,7 @@ fn generate_filter_fn<'a, 'tcx>(fcx: &FunctionContext<'a, 'tcx>,
     //          %ret = call i32 @the_real_filter_function(%ehptrs, %arg)
     //          ret i32 %ret
     //
-    // The recoverfp intrinsic is used to recover the frame frame pointer of the
+    // The recoverfp intrinsic is used to recover the frame pointer of the
     // `rust_try_fn` function, which is then in turn passed to the
     // `localrecover` intrinsic (pairing with the `localescape` intrinsic
     // mentioned above). Putting all this together means that we now have a

src/libstd/net/ip.rs

@@ -371,7 +371,7 @@ impl Ipv6Addr {
     }
 
     /// Returns true if this is an address reserved for documentation
-    /// This is defined to be 2001:db8::/32 in RFC RFC 3849
+    /// This is defined to be 2001:db8::/32 in RFC 3849.
     pub fn is_documentation(&self) -> bool {
         (self.segments()[0] == 0x2001) && (self.segments()[1] == 0xdb8)
     }

src/libstd/sys/unix/process.rs

@@ -147,7 +147,7 @@ impl Command {
         let new_key = pair_to_key(key, val, &mut self.saw_nul);
         let (map, envp) = self.init_env_map();
 
-        // If `key` is already present then we we just update `envp` in place
+        // If `key` is already present then we just update `envp` in place
         // (and store the owned value), but if it's not there we override the
         // trailing NULL pointer, add a new NULL pointer, and store where we
         // were located.

src/test/codegen-units/item-collection/cross-crate-closures.rs

@@ -27,7 +27,7 @@ fn main() {
     //~ TRANS_ITEM fn cgu_extern_closures::inlined_fn_generic[0]::{{closure}}[0]<i32>
     let _ = cgu_extern_closures::inlined_fn_generic(3, 4, 5i32);
 
-    // Nothing should be generated for this call, we just link to the instance instance
+    // Nothing should be generated for this call, we just link to the instance
     // in the extern crate.
     let _ = cgu_extern_closures::non_inlined_fn(6, 7);
 }

src/test/run-pass/regions-lub-ref-ref-rc.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // Test a corner case of LUB coercion. In this case, one arm of the
-// match requires a deref coercion and other other doesn't, and there
+// match requires a deref coercion and the other doesn't, and there
 // is an extra `&` on the `rc`. We want to be sure that the lifetime
 // assigned to this `&rc` value is not `'a` but something smaller.  In
 // other words, the type from `rc` is `&'a Rc<String>` and the type

src/tools/linkchecker/main.rs

@@ -110,7 +110,7 @@ fn walk(cache: &mut Cache,
             if let Some(pretty_path) = pretty_path {
                 let entry = cache.get_mut(&pretty_path).unwrap();
                 // we don't need the source anymore,
-                // so drop to to reduce memory-usage
+                // so drop to reduce memory-usage
                 entry.source = String::new();
             }
         }