Explain why inline default ToString impl
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@ -2196,6 +2196,9 @@ pub trait ToString {
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/// since `fmt::Write for String` never returns an error itself.
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#[stable(feature = "rust1", since = "1.0.0")]
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impl<T: fmt::Display + ?Sized> ToString for T {
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// A common guideline is to not inline generic functions. However,
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// remove `#[inline]` from this method causes non-negligible regression.
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// See <https://github.com/rust-lang/rust/pull/74852> as last attempt try to remove it.
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#[inline]
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default fn to_string(&self) -> String {
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use fmt::Write;
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