Commit6f6e343

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Rollup merge ofrust-lang#127091 - Sky9x:fused-error-sources-iter, r=dtolnay

impl FusedIterator and a size hint for the error sources itercc tracking issuerust-lang#58520

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Original file line number	Diff line number	Diff line change
`@@ -1008,8 +1008,15 @@ impl<'a> Iterator for Source<'a> {`
`1008`	`1008`	`self.current =self.current.and_then(Error::source);`
`1009`	`1009`	`current`
`1010`	`1010`	`}`
	`1011`	`+`
	`1012`	`+fnsize_hint(&self) ->(usize,Option<usize>){`
	`1013`	`+ifself.current.is_some(){(1,None)}else{(0,Some(0))}`
	`1014`	`+}`
`1011`	`1015`	`}`
`1012`	`1016`
	`1017`	`+#[unstable(feature ="error_iter", issue ="58520")]`
	`1018`	`+impl<'a>crate::iter::FusedIteratorforSource<'a>{}`
	`1019`	`+`
`1013`	`1020`	`#[stable(feature ="error_by_ref", since ="1.51.0")]`
`1014`	`1021`	`impl<'a,T:Error + ?Sized>Errorfor&'aT{`
`1015`	`1022`	`#[allow(deprecated, deprecated_in_future)]`

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