chore: remove duplicate words

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -403,7 +403,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             //
             // Why only in unoptimized builds?
             // - In unoptimized builds LLVM uses FastISel which does not support switches, so it
-            //   must fall back to the to the slower SelectionDAG isel. Therefore, using `br` gives
+            //   must fall back to the slower SelectionDAG isel. Therefore, using `br` gives
             //   significant compile time speedups for unoptimized builds.
             // - In optimized builds the above doesn't hold, and using `br` sometimes results in
             //   worse generated code because LLVM can no longer tell that the value being switched

compiler/rustc_const_eval/src/interpret/discriminant.rs

@@ -245,7 +245,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 // The tag of a `Single` enum is like the tag of the niched
                 // variant: there's no tag as the discriminant is encoded
                 // entirely implicitly. If `write_discriminant` ever hits this
-                // case, we do a "validation read" to ensure the the right
+                // case, we do a "validation read" to ensure the right
                 // discriminant is encoded implicitly, so any attempt to write
                 // the wrong discriminant for a `Single` enum will reliably
                 // result in UB.

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -499,7 +499,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     }
                 }
 
-                // If the shadowed binding has an an itializer expression,
+                // If the shadowed binding has an itializer expression,
                 // use the initializer expression'ty to try to find the method again.
                 // For example like:  `let mut x = Vec::new();`,
                 // `Vec::new()` is the itializer expression.
@@ -968,7 +968,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
 
             // Make sure that, if any traits other than the found ones were involved,
-            // we don't don't report an unimplemented trait.
+            // we don't report an unimplemented trait.
             // We don't want to say that `iter::Cloned` is not an iterator, just
             // because of some non-Clone item being iterated over.
             for (predicate, _parent_pred, _cause) in unsatisfied_predicates {

compiler/rustc_middle/src/ty/closure.rs

@@ -237,7 +237,7 @@ impl<'tcx> TyCtxt<'tcx> {
 /// Eg: 1. `foo.x` which is represented using `projections=[Field(x)]` is an ancestor of
 ///        `foo.x.y` which is represented using `projections=[Field(x), Field(y)]`.
 ///        Note both `foo.x` and `foo.x.y` start off of the same root variable `foo`.
-///     2. Since we only look at the projections here function will return `bar.x` as an a valid
+///     2. Since we only look at the projections here function will return `bar.x` as a valid
 ///        ancestor of `foo.x.y`. It's the caller's responsibility to ensure that both projections
 ///        list are being applied to the same root variable.
 pub fn is_ancestor_or_same_capture(

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -130,7 +130,7 @@ fn convert_to_hir_projections_and_truncate_for_capture(
 /// Eg: 1. `foo.x` which is represented using `projections=[Field(x)]` is an ancestor of
 ///        `foo.x.y` which is represented using `projections=[Field(x), Field(y)]`.
 ///        Note both `foo.x` and `foo.x.y` start off of the same root variable `foo`.
-///     2. Since we only look at the projections here function will return `bar.x` as an a valid
+///     2. Since we only look at the projections here function will return `bar.x` as a valid
 ///        ancestor of `foo.x.y`. It's the caller's responsibility to ensure that both projections
 ///        list are being applied to the same root variable.
 fn is_ancestor_or_same_capture(

compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs

@@ -138,7 +138,7 @@ impl<'tcx> ConstToPat<'tcx> {
             // lints, but no errors), double-check that all types in the const implement
             // `PartialEq`. Even if we have a valtree, we may have found something
             // in there with non-structural-equality, meaning we match using `PartialEq`
-            // and we hence have to check that that impl exists.
+            // and we hence have to check if that impl exists.
             // This is all messy but not worth cleaning up: at some point we'll emit
             // a hard error when we don't have a valtree or when we find something in
             // the valtree that is not structural; then this can all be made a lot simpler.

compiler/rustc_mir_transform/src/gvn.rs

@@ -8,7 +8,7 @@
 //! `Value` is interned as a `VnIndex`, which allows us to cheaply compute identical values.
 //!
 //! From those assignments, we construct a mapping `VnIndex -> Vec<(Local, Location)>` of available
-//! values, the locals in which they are stored, and a the assignment location.
+//! values, the locals in which they are stored, and the assignment location.
 //!
 //! In a second pass, we traverse all (non SSA) assignments `x = rvalue` and operands. For each
 //! one, we compute the `VnIndex` of the rvalue. If this `VnIndex` is associated to a constant, we

compiler/rustc_mir_transform/src/lib.rs

@@ -519,7 +519,7 @@ fn run_runtime_lowering_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         &add_subtyping_projections::Subtyper, // calling this after reveal_all ensures that we don't deal with opaque types
         &elaborate_drops::ElaborateDrops,
         // This will remove extraneous landing pads which are no longer
-        // necessary as well as well as forcing any call in a non-unwinding
+        // necessary as well as forcing any call in a non-unwinding
         // function calling a possibly-unwinding function to abort the process.
         &abort_unwinding_calls::AbortUnwindingCalls,
         // AddMovesForPackedDrops needs to run after drop

compiler/rustc_mir_transform/src/promote_consts.rs

@@ -816,7 +816,7 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
                     mut func, mut args, call_source: desugar, fn_span, ..
                 } => {
                     // This promoted involves a function call, so it may fail to evaluate.
-                    // Let's make sure it is added to `required_consts` so that that failure cannot get lost.
+                    // Let's make sure it is added to `required_consts` so that failure cannot get lost.
                     self.add_to_required = true;
 
                     self.visit_operand(&mut func, loc);

compiler/rustc_passes/src/dead.rs

@@ -102,7 +102,7 @@ fn ty_ref_to_pub_struct(tcx: TyCtxt<'_>, ty: &hir::Ty<'_>) -> Publicness {
     Publicness::new(true, true)
 }
 
-/// Determine if a work from the worklist is coming from the a `#[allow]`
+/// Determine if a work from the worklist is coming from a `#[allow]`
 /// or a `#[expect]` of `dead_code`
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
 enum ComesFromAllowExpect {

compiler/rustc_serialize/src/opaque.rs

@@ -155,7 +155,7 @@ impl FileEncoder {
         if std::intrinsics::unlikely(self.buffered > flush_threshold) {
             self.flush();
         }
-        // SAFETY: We checked above that that N < self.buffer_empty().len(),
+        // SAFETY: We checked above that N < self.buffer_empty().len(),
         // and if isn't, flush ensures that our empty buffer is now BUF_SIZE.
         // We produce a post-mono error if N > BUF_SIZE.
         let buf = unsafe { self.buffer_empty().first_chunk_mut::<N>().unwrap_unchecked() };

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -4114,7 +4114,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     expr = binding_expr;
                 }
                 if let hir::Node::Param(param) = parent {
-                    // ...and it is a an fn argument.
+                    // ...and it is an fn argument.
                     let prev_ty = self.resolve_vars_if_possible(
                         typeck_results
                             .node_type_opt(param.hir_id)

compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs

@@ -1296,7 +1296,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     expr = binding_expr;
                 }
                 if let hir::Node::Param(_param) = parent {
-                    // ...and it is a an fn argument.
+                    // ...and it is an fn argument.
                     break;
                 }
             }