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/// Asserts that left expression returns [`Some(T)`] variant /// and its value of `T` type equals to the right expression. /// /// ## Uses /// /// Assertions are always checked in both debug and release builds, and cannot be disabled. /// See [`debug_assert_some_eq!`] for assertions that are not enabled in release builds by default. /// /// ## Custom messages /// /// This macro has a second form, where a custom panic message can be provided /// with or without arguments for formatting. See [`std::fmt`] for syntax for this form. /// /// ## Examples /// /// ```rust /// # #[macro_use] extern crate claim; /// # fn main() { /// let maybe = Some(42); /// /// assert_some_eq!(maybe, 42); /// /// // With custom messages /// assert_some_eq!(maybe, 42, "Got some value"); /// # } /// ``` /// /// `None` variant will cause panic: /// /// ```rust,should_panic /// # #[macro_use] extern crate claim; /// # fn main() { /// let maybe: Option<i32> = None; /// /// assert_some_eq!(maybe, 42); // Will panic /// # } /// ``` /// /// [`Some(T)`]: https://doc.rust-lang.org/core/option/enum.Option.html#variant.Some /// [`std::fmt`]: https://doc.rust-lang.org/std/fmt/index.html /// [`debug_assert_some_eq!`]: ./macro.debug_assert_some_eq.html #[macro_export] macro_rules! assert_some_eq { ($cond:expr, $expected:expr,) => { $crate::assert_some_eq!($cond, $expected); }; ($cond:expr, $expected:expr) => { match $cond { Some(t) => { assert_eq!(t, $expected); t }, None => { panic!("assertion failed, expected Some(..), got None"); } } }; ($cond:expr, $expected:expr, $($arg:tt)+) => { match $cond { Some(t) => { assert_eq!(t, $expected); t }, None => { panic!("assertion failed, expected Some(..), got None: {}", format_args!($($arg)+)); } } }; } /// Asserts that expression returns [`Some(T)`] variant in runtime. /// /// Like [`assert_some_eq!`], this macro also has a second version, /// where a custom panic message can be provided. /// /// ## Uses /// /// See [`debug_assert!`] documentation for possible use cases. /// The same applies to this macro. /// /// [`Some(T)`]: https://doc.rust-lang.org/core/option/enum.Option.html#variant.Some /// [`debug_assert!`]: https://doc.rust-lang.org/std/macro.debug_assert.html /// [`assert_some_eq!`]: ./macro.assert_some_eq.html #[macro_export] macro_rules! debug_assert_some_eq { ($($arg:tt)*) => (if core::cfg!(debug_assertions) { $crate::assert_some_eq!($($arg)*); }) }