std: Use concat! and stringify! to simplify the most common assert! case.
With no custom message, we should just use concat! + stringify! for `assert!(expr)`. Inspired by issue #16625
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@ -96,7 +96,7 @@ macro_rules! fail(
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macro_rules! assert(
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($cond:expr) => (
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if !$cond {
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fail!("assertion failed: {:s}", stringify!($cond))
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fail!(concat!("assertion failed: ", stringify!($cond)))
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}
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);
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($cond:expr, $($arg:expr),+) => (
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