Rollup merge of #73963 - hellow554:unsafe_path, r=Mark-Simulacrum

deny(unsafe_op_in_unsafe_fn) in libstd/path.rs

The libstd/path.rs part of #73904 . Wraps the two calls to an unsafe fn Initializer::nop() in an unsafe block.

library/std/src/path.rs

@@ -58,6 +58,7 @@
 //! [`push`]: PathBuf::push
 
 #![stable(feature = "rust1", since = "1.0.0")]
+#![deny(unsafe_op_in_unsafe_fn)]
 
 #[cfg(test)]
 mod tests;
@@ -294,7 +295,8 @@ fn os_str_as_u8_slice(s: &OsStr) -> &[u8] {
     unsafe { &*(s as *const OsStr as *const [u8]) }
 }
 unsafe fn u8_slice_as_os_str(s: &[u8]) -> &OsStr {
-    &*(s as *const [u8] as *const OsStr)
+    // SAFETY: see the comment of `os_str_as_u8_slice`
+    unsafe { &*(s as *const [u8] as *const OsStr) }
 }
 
 // Detect scheme on Redox
@@ -314,24 +316,21 @@ fn has_physical_root(s: &[u8], prefix: Option<Prefix<'_>>) -> bool {
 
 // basic workhorse for splitting stem and extension
 fn split_file_at_dot(file: &OsStr) -> (Option<&OsStr>, Option<&OsStr>) {
-    unsafe {
-        if os_str_as_u8_slice(file) == b".." {
-            return (Some(file), None);
-        }
-
-        // The unsafety here stems from converting between &OsStr and &[u8]
-        // and back. This is safe to do because (1) we only look at ASCII
-        // contents of the encoding and (2) new &OsStr values are produced
-        // only from ASCII-bounded slices of existing &OsStr values.
+    if os_str_as_u8_slice(file) == b".." {
+        return (Some(file), None);
+    }
 
-        let mut iter = os_str_as_u8_slice(file).rsplitn(2, |b| *b == b'.');
-        let after = iter.next();
-        let before = iter.next();
-        if before == Some(b"") {
-            (Some(file), None)
-        } else {
-            (before.map(|s| u8_slice_as_os_str(s)), after.map(|s| u8_slice_as_os_str(s)))
-        }
+    // The unsafety here stems from converting between &OsStr and &[u8]
+    // and back. This is safe to do because (1) we only look at ASCII
+    // contents of the encoding and (2) new &OsStr values are produced
+    // only from ASCII-bounded slices of existing &OsStr values.
+    let mut iter = os_str_as_u8_slice(file).rsplitn(2, |b| *b == b'.');
+    let after = iter.next();
+    let before = iter.next();
+    if before == Some(b"") {
+        (Some(file), None)
+    } else {
+        unsafe { (before.map(|s| u8_slice_as_os_str(s)), after.map(|s| u8_slice_as_os_str(s))) }
     }
 }
 
@@ -1702,7 +1701,7 @@ impl Path {
     // The following (private!) function allows construction of a path from a u8
     // slice, which is only safe when it is known to follow the OsStr encoding.
     unsafe fn from_u8_slice(s: &[u8]) -> &Path {
-        Path::new(u8_slice_as_os_str(s))
+        unsafe { Path::new(u8_slice_as_os_str(s)) }
     }
     // The following (private!) function reveals the byte encoding used for OsStr.
     fn as_u8_slice(&self) -> &[u8] {