fix various typos in doc comments

src/liballoc/collections/btree/node.rs

@@ -69,7 +69,7 @@ struct LeafNode<K, V> {
 
     /// This node's index into the parent node's `edges` array.
     /// `*node.parent.edges[node.parent_idx]` should be the same thing as `node`.
-    /// This is only guaranteed to be initialized when `parent` is nonnull.
+    /// This is only guaranteed to be initialized when `parent` is non-null.
     parent_idx: MaybeUninit<u16>,
 
     /// The number of keys and values this node stores.

src/liballoc/raw_vec.rs

@@ -44,7 +44,7 @@ use boxed::Box;
 /// This enables you to use capacity growing logic catch the overflows in your length
 /// that might occur with zero-sized types.
 ///
-/// However this means that you need to be careful when roundtripping this type
+/// However this means that you need to be careful when round-tripping this type
 /// with a `Box<[T]>`: `cap()` won't yield the len. However `with_capacity`,
 /// `shrink_to_fit`, and `from_box` will actually set RawVec's private capacity
 /// field. This allows zero-sized types to not be special-cased by consumers of

src/libcore/num/f32.rs

@@ -445,7 +445,7 @@ impl f32 {
     /// signaling NaNs on MIPS are quiet NaNs on x86, and vice-versa.
     ///
     /// Rather than trying to preserve signaling-ness cross-platform, this
-    /// implementation favours preserving the exact bits. This means that
+    /// implementation favors preserving the exact bits. This means that
     /// any payloads encoded in NaNs will be preserved even if the result of
     /// this method is sent over the network from an x86 machine to a MIPS one.
     ///

src/libcore/task/wake.rs

@@ -108,7 +108,7 @@ impl Drop for Waker {
 /// is ready to be run.
 ///
 /// This is similar to the `Waker` type, but cannot be sent across threads.
-/// Task executors can use this type to implement more optimized singlethreaded wakeup
+/// Task executors can use this type to implement more optimized single-threaded wakeup
 /// behavior.
 #[repr(transparent)]
 #[derive(Clone)]

src/libproc_macro/lib.rs

@@ -535,7 +535,7 @@ impl TokenTree {
     }
 }
 
-/// Prints token treee in a form convenient for debugging.
+/// Prints token tree in a form convenient for debugging.
 #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
 impl fmt::Debug for TokenTree {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -730,7 +730,7 @@ impl fmt::Debug for Group {
 
 /// An `Punct` is an single punctuation character like `+`, `-` or `#`.
 ///
-/// Multicharacter operators like `+=` are represented as two instances of `Punct` with different
+/// Multi-character operators like `+=` are represented as two instances of `Punct` with different
 /// forms of `Spacing` returned.
 #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
 #[derive(Clone)]
@@ -788,7 +788,7 @@ impl Punct {
 
     /// Returns the spacing of this punctuation character, indicating whether it's immediately
     /// followed by another `Punct` in the token stream, so they can potentially be combined into
-    /// a multicharacter operator (`Joint`), or it's followed by some other token or whitespace
+    /// a multi-character operator (`Joint`), or it's followed by some other token or whitespace
     /// (`Alone`) so the operator has certainly ended.
     #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
     pub fn spacing(&self) -> Spacing {
@@ -947,7 +947,7 @@ macro_rules! suffixed_int_literals {
         /// This function will create an integer like `1u32` where the integer
         /// value specified is the first part of the token and the integral is
         /// also suffixed at the end.
-        /// Literals created from negative numbers may not survive rountrips through
+        /// Literals created from negative numbers may not survive round-trips through
         /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
         ///
         /// Literals created through this method have the `Span::call_site()`
@@ -1047,7 +1047,7 @@ impl Literal {
 
     /// Creates a new suffixed floating-point literal.
     ///
-    /// This consturctor will create a literal like `1.0f32` where the value
+    /// This constructor will create a literal like `1.0f32` where the value
     /// specified is the preceding part of the token and `f32` is the suffix of
     /// the token. This token will always be inferred to be an `f32` in the
     /// compiler.
@@ -1096,7 +1096,7 @@ impl Literal {
 
     /// Creates a new suffixed floating-point literal.
     ///
-    /// This consturctor will create a literal like `1.0f64` where the value
+    /// This constructor will create a literal like `1.0f64` where the value
     /// specified is the preceding part of the token and `f64` is the suffix of
     /// the token. This token will always be inferred to be an `f64` in the
     /// compiler.

src/librustc/dep_graph/cgu_reuse_tracker.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 //! Some facilities for tracking how codegen-units are reused during incremental
-//! compilition. This is used for incremental compiliation tests and debug
+//! compilation. This is used for incremental compilation tests and debug
 //! output.
 
 use session::Session;

src/librustc/hir/def.rs

@@ -36,7 +36,7 @@ pub enum NonMacroAttrKind {
     Tool,
     /// Single-segment custom attribute registered by a derive macro (`#[serde(default)]`).
     DeriveHelper,
-    /// Single-segment custom attriubte registered by a legacy plugin (`register_attribute`).
+    /// Single-segment custom attribute registered by a legacy plugin (`register_attribute`).
     LegacyPluginHelper,
     /// Single-segment custom attribute not registered in any way (`#[my_attr]`).
     Custom,

src/librustc/infer/canonical/canonicalizer.rs

@@ -10,7 +10,7 @@
 
 //! This module contains the "canonicalizer" itself.
 //!
-//! For an overview of what canonicaliation is and how it fits into
+//! For an overview of what canonicalization is and how it fits into
 //! rustc, check out the [chapter in the rustc guide][c].
 //!
 //! [c]: https://rust-lang-nursery.github.io/rustc-guide/traits/canonicalization.html

src/librustc/infer/canonical/query_response.rs

@@ -556,7 +556,7 @@ impl<'cx, 'gcx, 'tcx> InferCtxt<'cx, 'gcx, 'tcx> {
     }
 
     /// Given two sets of values for the same set of canonical variables, unify them.
-    /// The second set is produced lazilly by supplying indices from the first set.
+    /// The second set is produced lazily by supplying indices from the first set.
     fn unify_canonical_vars(
         &self,
         cause: &ObligationCause<'tcx>,

src/librustc/infer/canonical/substitute.rs

@@ -11,7 +11,7 @@
 //! This module contains code to substitute new values into a
 //! `Canonical<'tcx, T>`.
 //!
-//! For an overview of what canonicaliation is and how it fits into
+//! For an overview of what canonicalization is and how it fits into
 //! rustc, check out the [chapter in the rustc guide][c].
 //!
 //! [c]: https://rust-lang-nursery.github.io/rustc-guide/traits/canonicalization.html

src/librustc/infer/error_reporting/nice_region_error/outlives_closure.rs

@@ -20,7 +20,7 @@ use util::common::ErrorReported;
 use infer::lexical_region_resolve::RegionResolutionError::SubSupConflict;
 
 impl<'a, 'gcx, 'tcx> NiceRegionError<'a, 'gcx, 'tcx> {
-    /// Print the error message for lifetime errors when binding excapes a closure.
+    /// Print the error message for lifetime errors when binding escapes a closure.
     ///
     /// Consider a case where we have
     ///

src/librustc/infer/higher_ranked/mod.rs

@@ -428,7 +428,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     ///
     /// This routine is only intended to be used when the leak-check has
     /// passed; currently, it's used in the trait matching code to create
-    /// a set of nested obligations frmo an impl that matches against
+    /// a set of nested obligations from an impl that matches against
     /// something higher-ranked.  More details can be found in
     /// `librustc/middle/traits/README.md`.
     ///

src/librustc/infer/mod.rs

@@ -1160,10 +1160,10 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     }
 
     /// Takes ownership of the list of variable regions. This implies
-    /// that all the region constriants have already been taken, and
+    /// that all the region constraints have already been taken, and
     /// hence that `resolve_regions_and_report_errors` can never be
     /// called. This is used only during NLL processing to "hand off" ownership
-    /// of the set of region vairables into the NLL region context.
+    /// of the set of region variables into the NLL region context.
     pub fn take_region_var_origins(&self) -> VarInfos {
         let (var_infos, data) = self.region_constraints
             .borrow_mut()
@@ -1478,7 +1478,7 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     }
 
     /// Clears the selection, evaluation, and projection caches. This is useful when
-    /// repeatedly attemping to select an Obligation while changing only
+    /// repeatedly attempting to select an Obligation while changing only
     /// its ParamEnv, since FulfillmentContext doesn't use 'probe'
     pub fn clear_caches(&self) {
         self.selection_cache.clear();

src/librustc/infer/type_variable.rs

@@ -320,7 +320,7 @@ impl<'tcx> TypeVariableTable<'tcx> {
     /// but which have only been unified since `s` started, and
     /// return the types with which they were unified. So if we had
     /// a type variable `V0`, then we started the snapshot, then we
-    /// created a type variable `V1`, unifed `V0` with `T0`, and
+    /// created a type variable `V1`, unified `V0` with `T0`, and
     /// unified `V1` with `T1`, this function would return `{T0}`.
     pub fn types_escaping_snapshot(&mut self, s: &Snapshot<'tcx>) -> Vec<Ty<'tcx>> {
         let mut new_elem_threshold = u32::MAX;

src/librustc/lint/levels.rs

@@ -189,7 +189,7 @@ impl<'a> LintLevelsBuilder<'a> {
     /// This function will perform a number of tasks:
     ///
     /// * It'll validate all lint-related attributes in `attrs`
-    /// * It'll mark all lint-related attriutes as used
+    /// * It'll mark all lint-related attributes as used
     /// * Lint levels will be updated based on the attributes provided
     /// * Lint attributes are validated, e.g. a #[forbid] can't be switched to
     ///   #[allow]

src/librustc/session/config.rs

@@ -224,7 +224,7 @@ impl Default for ErrorOutputType {
 
 // Use tree-based collections to cheaply get a deterministic Hash implementation.
 // DO NOT switch BTreeMap out for an unsorted container type! That would break
-// dependency tracking for commandline arguments.
+// dependency tracking for command-line arguments.
 #[derive(Clone, Hash)]
 pub struct OutputTypes(BTreeMap<OutputType, Option<PathBuf>>);
 
@@ -273,7 +273,7 @@ impl OutputTypes {
 
 // Use tree-based collections to cheaply get a deterministic Hash implementation.
 // DO NOT switch BTreeMap or BTreeSet out for an unsorted container type! That
-// would break dependency tracking for commandline arguments.
+// would break dependency tracking for command-line arguments.
 #[derive(Clone, Hash)]
 pub struct Externs(BTreeMap<String, BTreeSet<Option<String>>>);
 
@@ -339,7 +339,7 @@ macro_rules! top_level_options {
     );
 }
 
-// The top-level commandline options struct
+// The top-level command-line options struct
 //
 // For each option, one has to specify how it behaves with regard to the
 // dependency tracking system of incremental compilation. This is done via the
@@ -2377,11 +2377,11 @@ impl fmt::Display for CrateType {
     }
 }
 
-/// Commandline arguments passed to the compiler have to be incorporated with
+/// Command-line arguments passed to the compiler have to be incorporated with
 /// the dependency tracking system for incremental compilation. This module
 /// provides some utilities to make this more convenient.
 ///
-/// The values of all commandline arguments that are relevant for dependency
+/// The values of all command-line arguments that are relevant for dependency
 /// tracking are hashed into a single value that determines whether the
 /// incremental compilation cache can be re-used or not. This hashing is done
 /// via the DepTrackingHash trait defined below, since the standard Hash
@@ -2394,7 +2394,7 @@ impl fmt::Display for CrateType {
 /// impl_dep_tracking_hash_via_hash!() macro that allows to simply reuse the
 /// Hash implementation for DepTrackingHash. It's important though that
 /// we have an opt-in scheme here, so one is hopefully forced to think about
-/// how the hash should be calculated when adding a new commandline argument.
+/// how the hash should be calculated when adding a new command-line argument.
 mod dep_tracking {
     use lint;
     use middle::cstore;

src/librustc/traits/query/dropck_outlives.rs

@@ -200,7 +200,7 @@ impl_stable_hash_for!(struct DtorckConstraint<'tcx> {
 /// trivial for dropck-outlives.
 ///
 /// Note also that `needs_drop` requires a "global" type (i.e., one
-/// with erased regions), but this funtcion does not.
+/// with erased regions), but this function does not.
 pub fn trivial_dropck_outlives<'tcx>(tcx: TyCtxt<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool {
     match ty.sty {
         // None of these types have a destructor and hence they do not

src/librustc/ty/fold.rs

@@ -783,7 +783,7 @@ pub fn shift_vars<'a, 'gcx, 'tcx, T>(
 ///
 /// Note that what I'm calling an "escaping var" is often just called a "free var". However,
 /// we already use the term "free var". It refers to the regions or types that we use to represent
-/// bound regions or type params on a fn definition while we are typechecking its body.
+/// bound regions or type params on a fn definition while we are type checking its body.
 ///
 /// To clarify, conceptually there is no particular difference between
 /// an "escaping" var and a "free" var. However, there is a big
@@ -859,7 +859,7 @@ struct LateBoundRegionsCollector {
 
     /// If true, we only want regions that are known to be
     /// "constrained" when you equate this type with another type. In
-    /// partcular, if you have e.g. `&'a u32` and `&'b u32`, equating
+    /// particular, if you have e.g. `&'a u32` and `&'b u32`, equating
     /// them constraints `'a == 'b`.  But if you have `<&'a u32 as
     /// Trait>::Foo` and `<&'b u32 as Trait>::Foo`, normalizing those
     /// types may mean that `'a` and `'b` don't appear in the results,

src/librustc/ty/layout.rs

@@ -1279,7 +1279,7 @@ impl<'a, 'tcx> LayoutCx<'tcx, TyCtxt<'a, 'tcx, 'tcx>> {
 /// Type size "skeleton", i.e. the only information determining a type's size.
 /// While this is conservative, (aside from constant sizes, only pointers,
 /// newtypes thereof and null pointer optimized enums are allowed), it is
-/// enough to statically check common usecases of transmute.
+/// enough to statically check common use cases of transmute.
 #[derive(Copy, Clone, Debug)]
 pub enum SizeSkeleton<'tcx> {
     /// Any statically computable Layout.

src/librustc/ty/mod.rs

@@ -2394,7 +2394,7 @@ impl<'a, 'gcx, 'tcx> FieldDef {
 
 /// Represents the various closure traits in the Rust language. This
 /// will determine the type of the environment (`self`, in the
-/// desuaring) argument that the closure expects.
+/// desugaring) argument that the closure expects.
 ///
 /// You can get the environment type of a closure using
 /// `tcx.closure_env_ty()`.

src/librustc_codegen_llvm/base.rs

@@ -941,7 +941,7 @@ pub fn codegen_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 ///
 /// In the process of working on rust-lang/rust#55238 a mysterious segfault was
 /// stumbled upon. The segfault was never reproduced locally, but it was
-/// suspected to be releated to the fact that codegen worker threads were
+/// suspected to be related to the fact that codegen worker threads were
 /// sticking around by the time the main thread was exiting, causing issues.
 ///
 /// This structure is an attempt to fix that issue where the `codegen_aborted`

src/librustc_codegen_llvm/llvm_util.rs

@@ -184,7 +184,7 @@ const WASM_WHITELIST: &[(&str, Option<&str>)] = &[
 ];
 
 /// When rustdoc is running, provide a list of all known features so that all their respective
-/// primtives may be documented.
+/// primitives may be documented.
 ///
 /// IMPORTANT: If you're adding another whitelist to the above lists, make sure to add it to this
 /// iterator!

src/librustc_codegen_utils/symbol_names.rs

@@ -79,7 +79,7 @@
 //! - In order to be able to also use symbols from two versions of the same
 //!   crate (which naturally also have the same name), a stronger measure is
 //!   required: The compiler accepts an arbitrary "disambiguator" value via the
-//!   `-C metadata` commandline argument. This disambiguator is then fed into
+//!   `-C metadata` command-line argument. This disambiguator is then fed into
 //!   the symbol hash of every exported item. Consequently, the symbols in two
 //!   identical crates but with different disambiguators are not in conflict
 //!   with each other. This facility is mainly intended to be used by build

src/librustc_data_structures/graph/scc/mod.rs

@@ -38,7 +38,7 @@ struct SccData<S: Idx> {
     /// successors can be found.
     ranges: IndexVec<S, Range<usize>>,
 
-    /// Contains the succcessors for all the Sccs, concatenated. The
+    /// Contains the successors for all the Sccs, concatenated. The
     /// range of indices corresponding to a given SCC is found in its
     /// SccData.
     all_successors: Vec<S>,

src/librustc_data_structures/owning_ref/mod.rs

@@ -452,7 +452,7 @@ impl<O, T: ?Sized> OwningRef<O, T> {
     /// use owning_ref::{OwningRef, Erased};
     ///
     /// fn main() {
-    ///     // NB: Using the concrete types here for explicitnes.
+    ///     // NB: Using the concrete types here for explicitness.
     ///     // For less verbose code type aliases like `BoxRef` are provided.
     ///
     ///     let owning_ref_a: OwningRef<Box<[i32; 4]>, [i32; 4]>
@@ -722,7 +722,7 @@ impl<O, T: ?Sized> OwningRefMut<O, T> {
     /// use owning_ref::{OwningRefMut, Erased};
     ///
     /// fn main() {
-    ///     // NB: Using the concrete types here for explicitnes.
+    ///     // NB: Using the concrete types here for explicitness.
     ///     // For less verbose code type aliases like `BoxRef` are provided.
     ///
     ///     let owning_ref_mut_a: OwningRefMut<Box<[i32; 4]>, [i32; 4]>

src/librustc_data_structures/sorted_map.rs

@@ -15,7 +15,7 @@ use std::mem;
 use std::ops::{RangeBounds, Bound, Index, IndexMut};
 
 /// `SortedMap` is a data structure with similar characteristics as BTreeMap but
-/// slightly different trade-offs: lookup, inseration, and removal are O(log(N))
+/// slightly different trade-offs: lookup, insertion, and removal are O(log(N))
 /// and elements can be iterated in order cheaply.
 ///
 /// `SortedMap` can be faster than a `BTreeMap` for small sizes (<50) since it

src/librustc_driver/lib.rs

@@ -643,8 +643,8 @@ impl Compilation {
     }
 }
 
-/// A trait for customising the compilation process. Offers a number of hooks for
-/// executing custom code or customising input.
+/// A trait for customizing the compilation process. Offers a number of hooks for
+/// executing custom code or customizing input.
 pub trait CompilerCalls<'a> {
     /// Hook for a callback early in the process of handling arguments. This will
     /// be called straight after options have been parsed but before anything

src/librustc_incremental/persist/dirty_clean.rs

@@ -160,7 +160,7 @@ const LABELS_FN_IN_TRAIT: &[&[&str]] = &[
     EXTRA_TRAIT,
 ];
 
-/// For generic cases like inline-assemply/mod/etc
+/// For generic cases like inline-assembly/mod/etc
 const LABELS_HIR_ONLY: &[&[&str]] = &[
     BASE_HIR,
 ];

src/librustc_lint/builtin.rs

@@ -1486,7 +1486,7 @@ declare_lint! {
     "detects edition keywords being used as an identifier"
 }
 
-/// Checks for uses of edtion keywords used as an identifier
+/// Checks for uses of edition keywords used as an identifier
 #[derive(Clone)]
 pub struct KeywordIdents;
 

src/librustc_mir/borrow_check/nll/type_check/mod.rs

@@ -111,7 +111,7 @@ mod relate_tys;
 /// - `liveness` -- results of a liveness computation on the MIR; used to create liveness
 ///   constraints for the regions in the types of variables
 /// - `flow_inits` -- results of a maybe-init dataflow analysis
-/// - `move_data` -- move-data constructed when performing the maybe-init dataflow analysiss
+/// - `move_data` -- move-data constructed when performing the maybe-init dataflow analysis
 pub(crate) fn type_check<'gcx, 'tcx>(
     infcx: &InferCtxt<'_, 'gcx, 'tcx>,
     param_env: ty::ParamEnv<'gcx>,

src/librustc_mir/borrow_check/places_conflict.rs

@@ -262,7 +262,7 @@ struct PlaceComponents<'p, 'tcx: 'p> {
 impl<'p, 'tcx> PlaceComponents<'p, 'tcx> {
     /// Converts a list of `Place` components into an iterator; this
     /// iterator yields up a never-ending stream of `Option<&Place>`.
-    /// These begin with the "innermst" place and then with each
+    /// These begin with the "innermost" place and then with each
     /// projection therefrom. So given a place like `a.b.c` it would
     /// yield up:
     ///