Auto merge of #50847 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 10 pull requests

Successful merges:

 - #50387 (Remove leftover tab in libtest outputs)
 - #50553 (Add Option::xor method)
 - #50610 (Improve format string errors)
 - #50649 (Tweak `nearest_common_ancestor()`.)
 - #50790 (Fix grammar documentation wrt Unicode identifiers)
 - #50791 (Fix null exclusions in grammar docs)
 - #50806 (Add `bless` x.py subcommand for easy ui test replacement)
 - #50818 (Speed up `opt_normalize_projection_type`)
 - #50837 (Revert #49767)
 - #50839 (Make sure people know the book is free oline)

Failed merges:

src/libsyntax_pos/lib.rs

@@ -428,6 +428,13 @@ impl Span {
         )
     }
 
+    pub fn from_inner_byte_pos(self, start: usize, end: usize) -> Span {
+        let span = self.data();
+        Span::new(span.lo + BytePos::from_usize(start),
+                  span.lo + BytePos::from_usize(end),
+                  span.ctxt)
+    }
+
     #[inline]
     pub fn apply_mark(self, mark: Mark) -> Span {
         let span = self.data();