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Rollup merge ofrust-lang#125112 - tbu-:pr_create_dir_all_empty, r=dtolnay

Document behavior of `create_dir_all` wrt. empty pathThe behavior makes sense because `Path::new("one_component").parent() == Some(Path::new(""))`, so if one naively wants to create the parent directory for a file to be written, it simply works.Closesrust-lang#105108 by documenting the current behavior.

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Original file line number	Diff line number	Diff line change
`@@ -2386,6 +2386,9 @@ pub fn create_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {`
`2386`	`2386`	`/// If this function returns an error, some of the parent components might have`
`2387`	`2387`	`/// been created already.`
`2388`	`2388`	`///`
	`2389`	`+/// If the empty path is passed to this function, it always succeeds without`
	`2390`	`+/// creating any directories.`
	`2391`	`+///`
`2389`	`2392`	`/// # Platform-specific behavior`
`2390`	`2393`	`///`
`2391`	`2394`	/// This function currently corresponds to multiple calls to the `mkdir`

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Commit04e46c2

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`‎std/src/fs.rs‎`

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