fix small word dupe typos

Author: Rageking8

compiler/rustc_error_codes/src/error_codes/E0591.md

@@ -53,8 +53,8 @@ unsafe {
 ```
 
 Here, transmute is being used to convert the types of the fn arguments.
-This pattern is incorrect because, because the type of `foo` is a function
-**item** (`typeof(foo)`), which is zero-sized, and the target type (`fn()`)
+This pattern is incorrect because the type of `foo` is a function **item**
+(`typeof(foo)`), which is zero-sized, and the target type (`fn()`)
 is a function pointer, which is not zero-sized.
 This pattern should be rewritten. There are a few possible ways to do this:
 

compiler/rustc_infer/src/infer/mod.rs

@@ -1283,7 +1283,7 @@ impl<'tcx> InferCtxt<'tcx> {
         assert!(old_value.is_none());
     }
 
-    /// Process the region constraints and return any any errors that
+    /// Process the region constraints and return any errors that
     /// result. After this, no more unification operations should be
     /// done -- or the compiler will panic -- but it is legal to use
     /// `resolve_vars_if_possible` as well as `fully_resolve`.

library/std/src/io/error/tests.rs

@@ -86,7 +86,7 @@ fn test_errorkind_packing() {
     assert_eq!(Error::from(ErrorKind::NotFound).kind(), ErrorKind::NotFound);
     assert_eq!(Error::from(ErrorKind::PermissionDenied).kind(), ErrorKind::PermissionDenied);
     assert_eq!(Error::from(ErrorKind::Uncategorized).kind(), ErrorKind::Uncategorized);
-    // Check that the innards look like like what we want.
+    // Check that the innards look like what we want.
     assert_matches!(
         Error::from(ErrorKind::OutOfMemory).repr.data(),
         ErrorData::Simple(ErrorKind::OutOfMemory),

library/std/src/sys/unix/kernel_copy.rs

@@ -20,7 +20,7 @@
 //! Since those syscalls have requirements that cannot be fully checked in advance and
 //! gathering additional information about file descriptors would require additional syscalls
 //! anyway it simply attempts to use them one after another (guided by inaccurate hints) to
-//! figure out which one works and and falls back to the generic read-write copy loop if none of them
+//! figure out which one works and falls back to the generic read-write copy loop if none of them
 //! does.
 //! Once a working syscall is found for a pair of file descriptors it will be called in a loop
 //! until the copy operation is completed.

src/test/ui/async-await/issue-64130-1-sync.rs

@@ -1,7 +1,7 @@
 #![feature(negative_impls)]
 // edition:2018
 
-// This tests the the specialized async-await-specific error when futures don't implement an
+// This tests the specialized async-await-specific error when futures don't implement an
 // auto trait (which is specifically Sync) due to some type that was captured.
 
 struct Foo;

src/test/ui/async-await/issue-64130-2-send.rs

@@ -1,7 +1,7 @@
 #![feature(negative_impls)]
 // edition:2018
 
-// This tests the the specialized async-await-specific error when futures don't implement an
+// This tests the specialized async-await-specific error when futures don't implement an
 // auto trait (which is specifically Send) due to some type that was captured.
 
 struct Foo;

src/test/ui/async-await/issue-64130-3-other.rs

@@ -2,7 +2,7 @@
 #![feature(negative_impls)]
 // edition:2018
 
-// This tests the the unspecialized async-await-specific error when futures don't implement an
+// This tests the unspecialized async-await-specific error when futures don't implement an
 // auto trait (which is not Send or Sync) due to some type that was captured.
 
 auto trait Qux {}

src/test/ui/const-generics/occurs-check/unused-substs-2.rs

@@ -1,7 +1,7 @@
 #![feature(generic_const_exprs)]
 #![allow(incomplete_features)]
 
-// The goal is is to get an unevaluated const `ct` with a `Ty::Infer(TyVar(_#1t)` subst.
+// The goal is to get an unevaluated const `ct` with a `Ty::Infer(TyVar(_#1t)` subst.
 //
 // If we are then able to infer `ty::Infer(TyVar(_#1t) := Ty<ct>` we introduced an
 // artificial inference cycle.

src/test/ui/const-generics/occurs-check/unused-substs-3.rs

@@ -1,7 +1,7 @@
 #![feature(generic_const_exprs)]
 #![allow(incomplete_features)]
 
-// The goal is is to get an unevaluated const `ct` with a `Ty::Infer(TyVar(_#1t)` subst.
+// The goal is to get an unevaluated const `ct` with a `Ty::Infer(TyVar(_#1t)` subst.
 //
 // If we are then able to infer `ty::Infer(TyVar(_#1t) := Ty<ct>` we introduced an
 // artificial inference cycle.

src/test/ui/deprecation/deprecation-lint.rs

@@ -51,7 +51,7 @@ mod cross_crate {
 
         let _ = nested::DeprecatedTupleStruct (1); //~ ERROR use of deprecated tuple struct `deprecation_lint::nested::DeprecatedTupleStruct`: text
 
-        // At the moment, the lint checker only checks stability in
+        // At the moment, the lint checker only checks stability
         // in the arguments of macros.
         // Eventually, we will want to lint the contents of the
         // macro in the module *defining* it. Also, stability levels