core::assert_eq!
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macro_rules! assert_eq { ($cond1:expr, $cond2:expr) => ({ let c1 = $cond1; let c2 = $cond2; if c1 != c2 || c2 != c1 { panic!("expressions not equal, left: {}, right: {}", c1, c2); } }) }
Runtime assertion for equality, for details see std::macros