Use consistent phrasing for all macro summaries

src/libcore/macros.rs

@@ -1,4 +1,6 @@
-/// Entry point of thread panic. For details, see `std::macros`.
+/// Panics the current thread.
+///
+/// For details, see `std::macros`.
 #[macro_export]
 #[allow_internal_unstable(core_panic, __rust_unstable_column)]
 #[stable(feature = "core", since = "1.6.0")]
@@ -132,7 +134,7 @@ macro_rules! assert_ne {
  });
 }
 
-/// Ensure that a boolean expression is `true` at runtime.
+/// Asserts that a boolean expression is `true` at runtime.
 ///
 /// This will invoke the [`panic!`] macro if the provided expression cannot be
 /// evaluated to `true` at runtime.
@@ -236,8 +238,7 @@ macro_rules! debug_assert_ne {
  ($($arg:tt)*) => (if cfg!(debug_assertions) { assert_ne!($($arg)*); })
 }
 
-/// Helper macro for reducing boilerplate code for matching `Result` together
-/// with converting downstream errors.
+/// Unwraps a result or propagates its error.
 ///
 /// The `?` operator was added to replace `try!` and should be used instead.
 /// Furthermore, `try` is a reserved word in Rust 2018, so if you must use
@@ -312,7 +313,7 @@ macro_rules! r#try {
  ($expr:expr,) => (r#try!($expr));
 }
 
-/// Write formatted data into a buffer.
+/// Writes formatted data into a buffer.
 ///
 /// This macro accepts a format string, a list of arguments, and a 'writer'. Arguments will be
 /// formatted according to the specified format string and the result will be passed to the writer.
@@ -434,7 +435,7 @@ macro_rules! writeln {
  );
 }
 
-/// A utility macro for indicating unreachable code.
+/// Indicates unreachable code.
 ///
 /// This is useful any time that the compiler can't determine that some code is unreachable. For
 /// example:
@@ -502,7 +503,7 @@ macro_rules! unreachable {
  });
 }
 
-/// A standardized placeholder for marking unfinished code.
+/// Indicates unfinished code.
 ///
 /// This can be useful if you are prototyping and are just looking to have your
 /// code type-check, or if you're implementing a trait that requires multiple
@@ -559,10 +560,10 @@ macro_rules! unimplemented {
  ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*)));
 }
 
-/// A standardized placeholder for marking unfinished code.
+/// Indicates unfinished code.
 ///
 /// This can be useful if you are prototyping and are just looking to have your
-/// code typecheck. `todo!` works exactly like `unimplemented!`, there only
+/// code typecheck. `todo!` works exactly like `unimplemented!`. The only
 /// difference between the two macros is the name.
 ///
 /// # Panics
@@ -618,7 +619,7 @@ macro_rules! todo {
  ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*)));
 }
 
-/// A macro to create an array of [`MaybeUninit`]
+/// Creates an array of [`MaybeUninit`].
 ///
 /// This macro constructs an uninitialized array of the type `[MaybeUninit<K>; N]`.
 ///
@@ -645,7 +646,7 @@ macro_rules! uninitialized_array {
 #[cfg(rustdoc)]
 mod builtin {
 
- /// Unconditionally causes compilation to fail with the given error message when encountered.
+ /// Causes compilation to fail with the given error message when encountered.
  ///
  /// For more information, see the documentation for [`std::compile_error!`].
  ///
@@ -657,7 +658,7 @@ mod builtin {
  ($msg:expr,) => ({ /* compiler built-in */ });
  }
 
- /// The core macro for formatted string creation & output.
+ /// Constructs parameters for the other string-formatting macros.
  ///
  /// For more information, see the documentation for [`std::format_args!`].
  ///
@@ -669,7 +670,7 @@ mod builtin {
  ($fmt:expr, $($args:tt)*) => ({ /* compiler built-in */ });
  }
 
- /// Inspect an environment variable at compile time.
+ /// Inspects an environment variable at compile time.
  ///
  /// For more information, see the documentation for [`std::env!`].
  ///
@@ -681,7 +682,7 @@ mod builtin {
  ($name:expr,) => ({ /* compiler built-in */ });
  }
 
- /// Optionally inspect an environment variable at compile time.
+ /// Optionally inspects an environment variable at compile time.
  ///
  /// For more information, see the documentation for [`std::option_env!`].
  ///
@@ -693,7 +694,7 @@ mod builtin {
  ($name:expr,) => ({ /* compiler built-in */ });
  }
 
- /// Concatenate identifiers into one identifier.
+ /// Concatenates identifiers into one identifier.
  ///
  /// For more information, see the documentation for [`std::concat_idents!`].
  ///
@@ -717,7 +718,7 @@ mod builtin {
  ($($e:expr,)*) => ({ /* compiler built-in */ });
  }
 
- /// A macro which expands to the line number on which it was invoked.
+ /// Expands to the line number on which it was invoked.
  ///
  /// For more information, see the documentation for [`std::line!`].
  ///
@@ -726,7 +727,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! line { () => ({ /* compiler built-in */ }) }
 
- /// A macro which expands to the column number on which it was invoked.
+ /// Expands to the column number on which it was invoked.
  ///
  /// For more information, see the documentation for [`std::column!`].
  ///
@@ -735,7 +736,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! column { () => ({ /* compiler built-in */ }) }
 
- /// A macro which expands to the file name from which it was invoked.
+ /// Expands to the file name from which it was invoked.
  ///
  /// For more information, see the documentation for [`std::file!`].
  ///
@@ -744,7 +745,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! file { () => ({ /* compiler built-in */ }) }
 
- /// A macro which stringifies its arguments.
+ /// Stringifies its arguments.
  ///
  /// For more information, see the documentation for [`std::stringify!`].
  ///
@@ -786,7 +787,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! module_path { () => ({ /* compiler built-in */ }) }
 
- /// Boolean evaluation of configuration flags, at compile-time.
+ /// Evaluates boolean combinations of configuration flags, at compile-time.
  ///
  /// For more information, see the documentation for [`std::cfg!`].
  ///
@@ -795,7 +796,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! cfg { ($($cfg:tt)*) => ({ /* compiler built-in */ }) }
 
- /// Parse a file as an expression or an item according to the context.
+ /// Parses a file as an expression or an item according to the context.
  ///
  /// For more information, see the documentation for [`std::include!`].
  ///
@@ -807,7 +808,7 @@ mod builtin {
  ($file:expr,) => ({ /* compiler built-in */ });
  }
 
- /// Ensure that a boolean expression is `true` at runtime.
+ /// Asserts that a boolean expression is `true` at runtime.
  ///
  /// For more information, see the documentation for [`std::assert!`].
  ///

src/libstd/macros.rs

@@ -4,7 +4,7 @@
 //! library. Each macro is available for use when linking against the standard
 //! library.
 
-/// The entry point for panic of Rust threads.
+/// Panics the current thread.
 ///
 /// This allows a program to terminate immediately and provide feedback
 /// to the caller of the program. `panic!` should be used when a program reaches
@@ -70,7 +70,7 @@ macro_rules! panic {
  });
 }
 
-/// Macro for printing to the standard output.
+/// Prints to the standard output.
 ///
 /// Equivalent to the [`println!`] macro except that a newline is not printed at
 /// the end of the message.
@@ -116,7 +116,7 @@ macro_rules! print {
  ($($arg:tt)*) => ($crate::io::_print(format_args!($($arg)*)));
 }
 
-/// Macro for printing to the standard output, with a newline.
+/// Prints to the standard output, with a newline.
 ///
 /// On all platforms, the newline is the LINE FEED character (`\n`/`U+000A`) alone
 /// (no additional CARRIAGE RETURN (`\r`/`U+000D`).
@@ -151,7 +151,7 @@ macro_rules! println {
  })
 }
 
-/// Macro for printing to the standard error.
+/// Prints to the standard error.
 ///
 /// Equivalent to the [`print!`] macro, except that output goes to
 /// [`io::stderr`] instead of `io::stdout`. See [`print!`] for
@@ -179,7 +179,7 @@ macro_rules! eprint {
  ($($arg:tt)*) => ($crate::io::_eprint(format_args!($($arg)*)));
 }
 
-/// Macro for printing to the standard error, with a newline.
+/// Prints to the standard error, with a newline.
 ///
 /// Equivalent to the [`println!`] macro, except that output goes to
 /// [`io::stderr`] instead of `io::stdout`. See [`println!`] for
@@ -210,8 +210,10 @@ macro_rules! eprintln {
  })
 }
 
-/// A macro for quick and dirty debugging with which you can inspect
-/// the value of a given expression. An example:
+/// Prints and returns the value of a given expression for quick and dirty
+/// debugging.
+///
+/// An example:
 ///
 /// ```rust
 /// let a = 2;
@@ -328,7 +330,7 @@ macro_rules! dbg {
  }
 }
 
-/// A macro to await on an async call.
+/// Awaits the completion of an async call.
 #[macro_export]
 #[unstable(feature = "await_macro", issue = "50547")]
 #[allow_internal_unstable(gen_future, generators)]
@@ -351,7 +353,7 @@ macro_rules! r#await {
  } }
 }
 
-/// A macro to select an event from a number of receivers.
+/// Selects the first successful receive event from a number of receivers.
 ///
 /// This macro is used to wait for the first event to occur on a number of
 /// receivers. It places no restrictions on the types of receivers given to
@@ -423,7 +425,7 @@ macro_rules! assert_approx_eq {
 #[cfg(rustdoc)]
 mod builtin {
 
- /// Unconditionally causes compilation to fail with the given error message when encountered.
+ /// Causes compilation to fail with the given error message when encountered.
  ///
  /// This macro should be used when a crate uses a conditional compilation strategy to provide
  /// better error messages for erroneous conditions. It's the compiler-level form of [`panic!`],
@@ -465,7 +467,7 @@ mod builtin {
  ($msg:expr,) => ({ /* compiler built-in */ });
  }
 
- /// The core macro for formatted string creation & output.
+ /// Constructs parameters for the other string-formatting macros.
  ///
  /// This macro functions by taking a formatting string literal containing
  /// `{}` for each additional argument passed. `format_args!` prepares the
@@ -517,7 +519,7 @@ mod builtin {
  ($fmt:expr, $($args:tt)*) => ({ /* compiler built-in */ });
  }
 
- /// Inspect an environment variable at compile time.
+ /// Inspects an environment variable at compile time.
  ///
  /// This macro will expand to the value of the named environment variable at
  /// compile time, yielding an expression of type `&'static str`.
@@ -555,7 +557,7 @@ mod builtin {
  ($name:expr,) => ({ /* compiler built-in */ });
  }
 
- /// Optionally inspect an environment variable at compile time.
+ /// Optionally inspects an environment variable at compile time.
  ///
  /// If the named environment variable is present at compile time, this will
  /// expand into an expression of type `Option<&'static str>` whose value is
@@ -581,7 +583,7 @@ mod builtin {
  ($name:expr,) => ({ /* compiler built-in */ });
  }
 
- /// Concatenate identifiers into one identifier.
+ /// Concatenates identifiers into one identifier.
  ///
  /// This macro takes any number of comma-separated identifiers, and
  /// concatenates them all into one, yielding an expression which is a new
@@ -634,7 +636,7 @@ mod builtin {
  ($($e:expr,)*) => ({ /* compiler built-in */ });
  }
 
- /// A macro which expands to the line number on which it was invoked.
+ /// Expands to the line number on which it was invoked.
  ///
  /// With [`column!`] and [`file!`], these macros provide debugging information for
  /// developers about the location within the source.
@@ -659,7 +661,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! line { () => ({ /* compiler built-in */ }) }
 
- /// A macro which expands to the column number on which it was invoked.
+ /// Expands to the column number at which it was invoked.
  ///
  /// With [`line!`] and [`file!`], these macros provide debugging information for
  /// developers about the location within the source.
@@ -684,7 +686,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! column { () => ({ /* compiler built-in */ }) }
 
- /// A macro which expands to the file name from which it was invoked.
+ /// Expands to the file name in which it was invoked.
  ///
  /// With [`line!`] and [`column!`], these macros provide debugging information for
  /// developers about the location within the source.
@@ -708,7 +710,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! file { () => ({ /* compiler built-in */ }) }
 
- /// A macro which stringifies its arguments.
+ /// Stringifies its arguments.
  ///
  /// This macro will yield an expression of type `&'static str` which is the
  /// stringification of all the tokens passed to the macro. No restrictions
@@ -822,7 +824,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! module_path { () => ({ /* compiler built-in */ }) }
 
- /// Boolean evaluation of configuration flags, at compile-time.
+ /// Evaluates boolean combinations of configuration flags at compile-time.
  ///
  /// In addition to the `#[cfg]` attribute, this macro is provided to allow
  /// boolean expression evaluation of configuration flags. This frequently
@@ -844,7 +846,7 @@ mod builtin {
  #[rustc_doc_only_macro]
  macro_rules! cfg { ($($cfg:tt)*) => ({ /* compiler built-in */ }) }
 
- /// Parse a file as an expression or an item according to the context.
+ /// Parses a file as an expression or an item according to the context.
  ///
  /// The file is located relative to the current file (similarly to how
  /// modules are found).
@@ -890,7 +892,7 @@ mod builtin {
  ($file:expr,) => ({ /* compiler built-in */ });
  }
 
- /// Ensure that a boolean expression is `true` at runtime.
+ /// Asserts that a boolean expression is `true` at runtime.
  ///
  /// This will invoke the [`panic!`] macro if the provided expression cannot be
  /// evaluated to `true` at runtime.
@@ -944,7 +946,7 @@ mod builtin {
  }
 }
 
-/// A macro for defining `#[cfg]` if-else statements.
+/// Defines `#[cfg]` if-else statements.
 ///
 /// This is similar to the `if/elif` C preprocessor macro by allowing definition
 /// of a cascade of `#[cfg]` cases, emitting the implementation which matches