| /// Entry point of thread panic. For details, see `std::macros`. |
| #[macro_export] |
| #[cfg_attr(not(stage0), allow_internal_unstable(core_panic, __rust_unstable_column))] |
| #[cfg_attr(stage0, allow_internal_unstable)] |
| #[stable(feature = "core", since = "1.6.0")] |
| macro_rules! panic { |
| () => ( |
| panic!("explicit panic") |
| ); |
| ($msg:expr) => ({ |
| $crate::panicking::panic(&($msg, file!(), line!(), __rust_unstable_column!())) |
| }); |
| ($msg:expr,) => ( |
| panic!($msg) |
| ); |
| ($fmt:expr, $($arg:tt)+) => ({ |
| $crate::panicking::panic_fmt(format_args!($fmt, $($arg)*), |
| &(file!(), line!(), __rust_unstable_column!())) |
| }); |
| } |
| |
| /// Asserts that two expressions are equal to each other (using [`PartialEq`]). |
| /// |
| /// On panic, this macro will print the values of the expressions with their |
| /// debug representations. |
| /// |
| /// Like [`assert!`], this macro has a second form, where a custom |
| /// panic message can be provided. |
| /// |
| /// [`PartialEq`]: cmp/trait.PartialEq.html |
| /// [`assert!`]: macro.assert.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// let a = 3; |
| /// let b = 1 + 2; |
| /// assert_eq!(a, b); |
| /// |
| /// assert_eq!(a, b, "we are testing addition with {} and {}", a, b); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! assert_eq { |
| ($left:expr, $right:expr) => ({ |
| match (&$left, &$right) { |
| (left_val, right_val) => { |
| if !(*left_val == *right_val) { |
| // The reborrows below are intentional. Without them, the stack slot for the |
| // borrow is initialized even before the values are compared, leading to a |
| // noticeable slow down. |
| panic!(r#"assertion failed: `(left == right)` |
| left: `{:?}`, |
| right: `{:?}`"#, &*left_val, &*right_val) |
| } |
| } |
| } |
| }); |
| ($left:expr, $right:expr,) => ({ |
| assert_eq!($left, $right) |
| }); |
| ($left:expr, $right:expr, $($arg:tt)+) => ({ |
| match (&($left), &($right)) { |
| (left_val, right_val) => { |
| if !(*left_val == *right_val) { |
| // The reborrows below are intentional. Without them, the stack slot for the |
| // borrow is initialized even before the values are compared, leading to a |
| // noticeable slow down. |
| panic!(r#"assertion failed: `(left == right)` |
| left: `{:?}`, |
| right: `{:?}`: {}"#, &*left_val, &*right_val, |
| format_args!($($arg)+)) |
| } |
| } |
| } |
| }); |
| } |
| |
| /// Asserts that two expressions are not equal to each other (using [`PartialEq`]). |
| /// |
| /// On panic, this macro will print the values of the expressions with their |
| /// debug representations. |
| /// |
| /// Like [`assert!`], this macro has a second form, where a custom |
| /// panic message can be provided. |
| /// |
| /// [`PartialEq`]: cmp/trait.PartialEq.html |
| /// [`assert!`]: macro.assert.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// let a = 3; |
| /// let b = 2; |
| /// assert_ne!(a, b); |
| /// |
| /// assert_ne!(a, b, "we are testing that the values are not equal"); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "assert_ne", since = "1.13.0")] |
| macro_rules! assert_ne { |
| ($left:expr, $right:expr) => ({ |
| match (&$left, &$right) { |
| (left_val, right_val) => { |
| if *left_val == *right_val { |
| // The reborrows below are intentional. Without them, the stack slot for the |
| // borrow is initialized even before the values are compared, leading to a |
| // noticeable slow down. |
| panic!(r#"assertion failed: `(left != right)` |
| left: `{:?}`, |
| right: `{:?}`"#, &*left_val, &*right_val) |
| } |
| } |
| } |
| }); |
| ($left:expr, $right:expr,) => { |
| assert_ne!($left, $right) |
| }; |
| ($left:expr, $right:expr, $($arg:tt)+) => ({ |
| match (&($left), &($right)) { |
| (left_val, right_val) => { |
| if *left_val == *right_val { |
| // The reborrows below are intentional. Without them, the stack slot for the |
| // borrow is initialized even before the values are compared, leading to a |
| // noticeable slow down. |
| panic!(r#"assertion failed: `(left != right)` |
| left: `{:?}`, |
| right: `{:?}`: {}"#, &*left_val, &*right_val, |
| format_args!($($arg)+)) |
| } |
| } |
| } |
| }); |
| } |
| |
| /// Ensure 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. |
| /// |
| /// Like [`assert!`], this macro also has a second version, where a custom panic |
| /// message can be provided. |
| /// |
| /// # Uses |
| /// |
| /// Unlike [`assert!`], `debug_assert!` statements are only enabled in non |
| /// optimized builds by default. An optimized build will omit all |
| /// `debug_assert!` statements unless `-C debug-assertions` is passed to the |
| /// compiler. This makes `debug_assert!` useful for checks that are too |
| /// expensive to be present in a release build but may be helpful during |
| /// development. |
| /// |
| /// An unchecked assertion allows a program in an inconsistent state to keep |
| /// running, which might have unexpected consequences but does not introduce |
| /// unsafety as long as this only happens in safe code. The performance cost |
| /// of assertions, is however, not measurable in general. Replacing [`assert!`] |
| /// with `debug_assert!` is thus only encouraged after thorough profiling, and |
| /// more importantly, only in safe code! |
| /// |
| /// [`panic!`]: macro.panic.html |
| /// [`assert!`]: macro.assert.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// // the panic message for these assertions is the stringified value of the |
| /// // expression given. |
| /// debug_assert!(true); |
| /// |
| /// fn some_expensive_computation() -> bool { true } // a very simple function |
| /// debug_assert!(some_expensive_computation()); |
| /// |
| /// // assert with a custom message |
| /// let x = true; |
| /// debug_assert!(x, "x wasn't true!"); |
| /// |
| /// let a = 3; let b = 27; |
| /// debug_assert!(a + b == 30, "a = {}, b = {}", a, b); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! debug_assert { |
| ($($arg:tt)*) => (if cfg!(debug_assertions) { assert!($($arg)*); }) |
| } |
| |
| /// Asserts that two expressions are equal to each other. |
| /// |
| /// On panic, this macro will print the values of the expressions with their |
| /// debug representations. |
| /// |
| /// Unlike [`assert_eq!`], `debug_assert_eq!` statements are only enabled in non |
| /// optimized builds by default. An optimized build will omit all |
| /// `debug_assert_eq!` statements unless `-C debug-assertions` is passed to the |
| /// compiler. This makes `debug_assert_eq!` useful for checks that are too |
| /// expensive to be present in a release build but may be helpful during |
| /// development. |
| /// |
| /// [`assert_eq!`]: ../std/macro.assert_eq.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// let a = 3; |
| /// let b = 1 + 2; |
| /// debug_assert_eq!(a, b); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! debug_assert_eq { |
| ($($arg:tt)*) => (if cfg!(debug_assertions) { assert_eq!($($arg)*); }) |
| } |
| |
| /// Asserts that two expressions are not equal to each other. |
| /// |
| /// On panic, this macro will print the values of the expressions with their |
| /// debug representations. |
| /// |
| /// Unlike [`assert_ne!`], `debug_assert_ne!` statements are only enabled in non |
| /// optimized builds by default. An optimized build will omit all |
| /// `debug_assert_ne!` statements unless `-C debug-assertions` is passed to the |
| /// compiler. This makes `debug_assert_ne!` useful for checks that are too |
| /// expensive to be present in a release build but may be helpful during |
| /// development. |
| /// |
| /// [`assert_ne!`]: ../std/macro.assert_ne.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// let a = 3; |
| /// let b = 2; |
| /// debug_assert_ne!(a, b); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "assert_ne", since = "1.13.0")] |
| 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. |
| /// |
| /// 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 |
| /// it, you will need to use the [raw-identifier syntax][ris]: `r#try`. |
| /// |
| /// [ris]: https://doc.rust-lang.org/nightly/rust-by-example/compatibility/raw_identifiers.html |
| /// |
| /// `try!` matches the given [`Result`]. In case of the `Ok` variant, the |
| /// expression has the value of the wrapped value. |
| /// |
| /// In case of the `Err` variant, it retrieves the inner error. `try!` then |
| /// performs conversion using `From`. This provides automatic conversion |
| /// between specialized errors and more general ones. The resulting |
| /// error is then immediately returned. |
| /// |
| /// Because of the early return, `try!` can only be used in functions that |
| /// return [`Result`]. |
| /// |
| /// [`Result`]: ../std/result/enum.Result.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io; |
| /// use std::fs::File; |
| /// use std::io::prelude::*; |
| /// |
| /// enum MyError { |
| /// FileWriteError |
| /// } |
| /// |
| /// impl From<io::Error> for MyError { |
| /// fn from(e: io::Error) -> MyError { |
| /// MyError::FileWriteError |
| /// } |
| /// } |
| /// |
| /// // The preferred method of quick returning Errors |
| /// fn write_to_file_question() -> Result<(), MyError> { |
| /// let mut file = File::create("my_best_friends.txt")?; |
| /// file.write_all(b"This is a list of my best friends.")?; |
| /// Ok(()) |
| /// } |
| /// |
| /// // The previous method of quick returning Errors |
| /// fn write_to_file_using_try() -> Result<(), MyError> { |
| /// let mut file = r#try!(File::create("my_best_friends.txt")); |
| /// r#try!(file.write_all(b"This is a list of my best friends.")); |
| /// Ok(()) |
| /// } |
| /// |
| /// // This is equivalent to: |
| /// fn write_to_file_using_match() -> Result<(), MyError> { |
| /// let mut file = r#try!(File::create("my_best_friends.txt")); |
| /// match file.write_all(b"This is a list of my best friends.") { |
| /// Ok(v) => v, |
| /// Err(e) => return Err(From::from(e)), |
| /// } |
| /// Ok(()) |
| /// } |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[doc(alias = "?")] |
| macro_rules! r#try { |
| ($expr:expr) => (match $expr { |
| $crate::result::Result::Ok(val) => val, |
| $crate::result::Result::Err(err) => { |
| return $crate::result::Result::Err($crate::convert::From::from(err)) |
| } |
| }); |
| ($expr:expr,) => (r#try!($expr)); |
| } |
| |
| /// Write 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. |
| /// The writer may be any value with a `write_fmt` method; generally this comes from an |
| /// implementation of either the [`std::fmt::Write`] or the [`std::io::Write`] trait. The macro |
| /// returns whatever the `write_fmt` method returns; commonly a [`std::fmt::Result`], or an |
| /// [`io::Result`]. |
| /// |
| /// See [`std::fmt`] for more information on the format string syntax. |
| /// |
| /// [`std::fmt`]: ../std/fmt/index.html |
| /// [`std::fmt::Write`]: ../std/fmt/trait.Write.html |
| /// [`std::io::Write`]: ../std/io/trait.Write.html |
| /// [`std::fmt::Result`]: ../std/fmt/type.Result.html |
| /// [`io::Result`]: ../std/io/type.Result.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io::Write; |
| /// |
| /// let mut w = Vec::new(); |
| /// write!(&mut w, "test").unwrap(); |
| /// write!(&mut w, "formatted {}", "arguments").unwrap(); |
| /// |
| /// assert_eq!(w, b"testformatted arguments"); |
| /// ``` |
| /// |
| /// A module can import both `std::fmt::Write` and `std::io::Write` and call `write!` on objects |
| /// implementing either, as objects do not typically implement both. However, the module must |
| /// import the traits qualified so their names do not conflict: |
| /// |
| /// ``` |
| /// use std::fmt::Write as FmtWrite; |
| /// use std::io::Write as IoWrite; |
| /// |
| /// let mut s = String::new(); |
| /// let mut v = Vec::new(); |
| /// write!(&mut s, "{} {}", "abc", 123).unwrap(); // uses fmt::Write::write_fmt |
| /// write!(&mut v, "s = {:?}", s).unwrap(); // uses io::Write::write_fmt |
| /// assert_eq!(v, b"s = \"abc 123\""); |
| /// ``` |
| /// |
| /// Note: This macro can be used in `no_std` setups as well. |
| /// In a `no_std` setup you are responsible for the implementation details of the components. |
| /// |
| /// ```no_run |
| /// # extern crate core; |
| /// use core::fmt::Write; |
| /// |
| /// struct Example; |
| /// |
| /// impl Write for Example { |
| /// fn write_str(&mut self, _s: &str) -> core::fmt::Result { |
| /// unimplemented!(); |
| /// } |
| /// } |
| /// |
| /// let mut m = Example{}; |
| /// write!(&mut m, "Hello World").expect("Not written"); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! write { |
| ($dst:expr, $($arg:tt)*) => ($dst.write_fmt(format_args!($($arg)*))) |
| } |
| |
| /// Write formatted data into a buffer, with a newline appended. |
| /// |
| /// On all platforms, the newline is the LINE FEED character (`\n`/`U+000A`) alone |
| /// (no additional CARRIAGE RETURN (`\r`/`U+000D`). |
| /// |
| /// For more information, see [`write!`]. For information on the format string syntax, see |
| /// [`std::fmt`]. |
| /// |
| /// [`write!`]: macro.write.html |
| /// [`std::fmt`]: ../std/fmt/index.html |
| /// |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io::Write; |
| /// |
| /// let mut w = Vec::new(); |
| /// writeln!(&mut w).unwrap(); |
| /// writeln!(&mut w, "test").unwrap(); |
| /// writeln!(&mut w, "formatted {}", "arguments").unwrap(); |
| /// |
| /// assert_eq!(&w[..], "\ntest\nformatted arguments\n".as_bytes()); |
| /// ``` |
| /// |
| /// A module can import both `std::fmt::Write` and `std::io::Write` and call `write!` on objects |
| /// implementing either, as objects do not typically implement both. However, the module must |
| /// import the traits qualified so their names do not conflict: |
| /// |
| /// ``` |
| /// use std::fmt::Write as FmtWrite; |
| /// use std::io::Write as IoWrite; |
| /// |
| /// let mut s = String::new(); |
| /// let mut v = Vec::new(); |
| /// writeln!(&mut s, "{} {}", "abc", 123).unwrap(); // uses fmt::Write::write_fmt |
| /// writeln!(&mut v, "s = {:?}", s).unwrap(); // uses io::Write::write_fmt |
| /// assert_eq!(v, b"s = \"abc 123\\n\"\n"); |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[cfg_attr(stage0, allow_internal_unstable)] |
| #[cfg_attr(not(stage0), allow_internal_unstable(format_args_nl))] |
| macro_rules! writeln { |
| ($dst:expr) => ( |
| write!($dst, "\n") |
| ); |
| ($dst:expr,) => ( |
| writeln!($dst) |
| ); |
| ($dst:expr, $($arg:tt)*) => ( |
| $dst.write_fmt(format_args_nl!($($arg)*)) |
| ); |
| } |
| |
| /// A utility macro for indicating unreachable code. |
| /// |
| /// This is useful any time that the compiler can't determine that some code is unreachable. For |
| /// example: |
| /// |
| /// * Match arms with guard conditions. |
| /// * Loops that dynamically terminate. |
| /// * Iterators that dynamically terminate. |
| /// |
| /// If the determination that the code is unreachable proves incorrect, the |
| /// program immediately terminates with a [`panic!`]. The function [`unreachable_unchecked`], |
| /// which belongs to the [`std::hint`] module, informs the compiler to |
| /// optimize the code out of the release version entirely. |
| /// |
| /// [`panic!`]: ../std/macro.panic.html |
| /// [`unreachable_unchecked`]: ../std/hint/fn.unreachable_unchecked.html |
| /// [`std::hint`]: ../std/hint/index.html |
| /// |
| /// # Panics |
| /// |
| /// This will always [`panic!`] |
| /// |
| /// [`panic!`]: ../std/macro.panic.html |
| /// # Examples |
| /// |
| /// Match arms: |
| /// |
| /// ``` |
| /// # #[allow(dead_code)] |
| /// fn foo(x: Option<i32>) { |
| /// match x { |
| /// Some(n) if n >= 0 => println!("Some(Non-negative)"), |
| /// Some(n) if n < 0 => println!("Some(Negative)"), |
| /// Some(_) => unreachable!(), // compile error if commented out |
| /// None => println!("None") |
| /// } |
| /// } |
| /// ``` |
| /// |
| /// Iterators: |
| /// |
| /// ``` |
| /// # #[allow(dead_code)] |
| /// fn divide_by_three(x: u32) -> u32 { // one of the poorest implementations of x/3 |
| /// for i in 0.. { |
| /// if 3*i < i { panic!("u32 overflow"); } |
| /// if x < 3*i { return i-1; } |
| /// } |
| /// unreachable!(); |
| /// } |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! unreachable { |
| () => ({ |
| panic!("internal error: entered unreachable code") |
| }); |
| ($msg:expr) => ({ |
| unreachable!("{}", $msg) |
| }); |
| ($msg:expr,) => ({ |
| unreachable!($msg) |
| }); |
| ($fmt:expr, $($arg:tt)*) => ({ |
| panic!(concat!("internal error: entered unreachable code: ", $fmt), $($arg)*) |
| }); |
| } |
| |
| /// A standardized placeholder for marking 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 |
| /// methods, and you're only planning on using one of them. |
| /// |
| /// # Panics |
| /// |
| /// This will always [panic!](macro.panic.html) |
| /// |
| /// # Examples |
| /// |
| /// Here's an example of some in-progress code. We have a trait `Foo`: |
| /// |
| /// ``` |
| /// trait Foo { |
| /// fn bar(&self); |
| /// fn baz(&self); |
| /// } |
| /// ``` |
| /// |
| /// We want to implement `Foo` on one of our types, but we also want to work on |
| /// just `bar()` first. In order for our code to compile, we need to implement |
| /// `baz()`, so we can use `unimplemented!`: |
| /// |
| /// ``` |
| /// # trait Foo { |
| /// # fn bar(&self); |
| /// # fn baz(&self); |
| /// # } |
| /// struct MyStruct; |
| /// |
| /// impl Foo for MyStruct { |
| /// fn bar(&self) { |
| /// // implementation goes here |
| /// } |
| /// |
| /// fn baz(&self) { |
| /// // let's not worry about implementing baz() for now |
| /// unimplemented!(); |
| /// } |
| /// } |
| /// |
| /// fn main() { |
| /// let s = MyStruct; |
| /// s.bar(); |
| /// |
| /// // we aren't even using baz() yet, so this is fine. |
| /// } |
| /// ``` |
| #[macro_export] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! unimplemented { |
| () => (panic!("not yet implemented")); |
| ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*))); |
| } |
| |
| /// A macro to create an array of [`MaybeUninit`] |
| /// |
| /// This macro constructs an uninitialized array of the type `[MaybeUninit<K>; N]`. |
| /// |
| /// [`MaybeUninit`]: mem/union.MaybeUninit.html |
| #[macro_export] |
| #[unstable(feature = "maybe_uninit_array", issue = "53491")] |
| macro_rules! uninitialized_array { |
| // This `into_initialized` is safe because an array of `MaybeUninit` does not |
| // require initialization. |
| // FIXME(#49147): Could be replaced by an array initializer, once those can |
| // be any const expression. |
| ($t:ty; $size:expr) => (unsafe { |
| MaybeUninit::<[MaybeUninit<$t>; $size]>::uninitialized().into_initialized() |
| }); |
| } |
| |
| /// Built-in macros to the compiler itself. |
| /// |
| /// These macros do not have any corresponding definition with a `macro_rules!` |
| /// macro, but are documented here. Their implementations can be found hardcoded |
| /// into libsyntax itself. |
| /// |
| /// For more information, see documentation for `std`'s macros. |
| #[cfg(rustdoc)] |
| mod builtin { |
| |
| /// Unconditionally causes compilation to fail with the given error message when encountered. |
| /// |
| /// For more information, see the documentation for [`std::compile_error!`]. |
| /// |
| /// [`std::compile_error!`]: ../std/macro.compile_error.html |
| #[stable(feature = "compile_error_macro", since = "1.20.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! compile_error { |
| ($msg:expr) => ({ /* compiler built-in */ }); |
| ($msg:expr,) => ({ /* compiler built-in */ }); |
| } |
| |
| /// The core macro for formatted string creation & output. |
| /// |
| /// For more information, see the documentation for [`std::format_args!`]. |
| /// |
| /// [`std::format_args!`]: ../std/macro.format_args.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! format_args { |
| ($fmt:expr) => ({ /* compiler built-in */ }); |
| ($fmt:expr, $($args:tt)*) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Inspect an environment variable at compile time. |
| /// |
| /// For more information, see the documentation for [`std::env!`]. |
| /// |
| /// [`std::env!`]: ../std/macro.env.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! env { |
| ($name:expr) => ({ /* compiler built-in */ }); |
| ($name:expr,) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Optionally inspect an environment variable at compile time. |
| /// |
| /// For more information, see the documentation for [`std::option_env!`]. |
| /// |
| /// [`std::option_env!`]: ../std/macro.option_env.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! option_env { |
| ($name:expr) => ({ /* compiler built-in */ }); |
| ($name:expr,) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Concatenate identifiers into one identifier. |
| /// |
| /// For more information, see the documentation for [`std::concat_idents!`]. |
| /// |
| /// [`std::concat_idents!`]: ../std/macro.concat_idents.html |
| #[unstable(feature = "concat_idents_macro", issue = "29599")] |
| #[rustc_doc_only_macro] |
| macro_rules! concat_idents { |
| ($($e:ident),+) => ({ /* compiler built-in */ }); |
| ($($e:ident,)+) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Concatenates literals into a static string slice. |
| /// |
| /// For more information, see the documentation for [`std::concat!`]. |
| /// |
| /// [`std::concat!`]: ../std/macro.concat.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! concat { |
| ($($e:expr),*) => ({ /* compiler built-in */ }); |
| ($($e:expr,)*) => ({ /* compiler built-in */ }); |
| } |
| |
| /// A macro which expands to the line number on which it was invoked. |
| /// |
| /// For more information, see the documentation for [`std::line!`]. |
| /// |
| /// [`std::line!`]: ../std/macro.line.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! line { () => ({ /* compiler built-in */ }) } |
| |
| /// A macro which expands to the column number on which it was invoked. |
| /// |
| /// For more information, see the documentation for [`std::column!`]. |
| /// |
| /// [`std::column!`]: ../std/macro.column.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! column { () => ({ /* compiler built-in */ }) } |
| |
| /// A macro which expands to the file name from which it was invoked. |
| /// |
| /// For more information, see the documentation for [`std::file!`]. |
| /// |
| /// [`std::file!`]: ../std/macro.file.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! file { () => ({ /* compiler built-in */ }) } |
| |
| /// A macro which stringifies its arguments. |
| /// |
| /// For more information, see the documentation for [`std::stringify!`]. |
| /// |
| /// [`std::stringify!`]: ../std/macro.stringify.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! stringify { ($($t:tt)*) => ({ /* compiler built-in */ }) } |
| |
| /// Includes a utf8-encoded file as a string. |
| /// |
| /// For more information, see the documentation for [`std::include_str!`]. |
| /// |
| /// [`std::include_str!`]: ../std/macro.include_str.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! include_str { |
| ($file:expr) => ({ /* compiler built-in */ }); |
| ($file:expr,) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Includes a file as a reference to a byte array. |
| /// |
| /// For more information, see the documentation for [`std::include_bytes!`]. |
| /// |
| /// [`std::include_bytes!`]: ../std/macro.include_bytes.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! include_bytes { |
| ($file:expr) => ({ /* compiler built-in */ }); |
| ($file:expr,) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Expands to a string that represents the current module path. |
| /// |
| /// For more information, see the documentation for [`std::module_path!`]. |
| /// |
| /// [`std::module_path!`]: ../std/macro.module_path.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! module_path { () => ({ /* compiler built-in */ }) } |
| |
| /// Boolean evaluation of configuration flags, at compile-time. |
| /// |
| /// For more information, see the documentation for [`std::cfg!`]. |
| /// |
| /// [`std::cfg!`]: ../std/macro.cfg.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[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. |
| /// |
| /// For more information, see the documentation for [`std::include!`]. |
| /// |
| /// [`std::include!`]: ../std/macro.include.html |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_doc_only_macro] |
| macro_rules! include { |
| ($file:expr) => ({ /* compiler built-in */ }); |
| ($file:expr,) => ({ /* compiler built-in */ }); |
| } |
| |
| /// Ensure that a boolean expression is `true` at runtime. |
| /// |
| /// For more information, see the documentation for [`std::assert!`]. |
| /// |
| /// [`std::assert!`]: ../std/macro.assert.html |
| #[rustc_doc_only_macro] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| macro_rules! assert { |
| ($cond:expr) => ({ /* compiler built-in */ }); |
| ($cond:expr,) => ({ /* compiler built-in */ }); |
| ($cond:expr, $($arg:tt)+) => ({ /* compiler built-in */ }); |
| } |
| } |