Auto merge of rust-lang#111380 - Dylan-DPC:rollup-xiptbhn, r=Dylan-DPC

Rollup of 7 pull requests

Successful merges:

 - rust-lang#110304 (Add GNU Property Note)
 - rust-lang#110504 (Tweak borrow suggestion span)
 - rust-lang#110583 (tweak "make mut" spans when assigning to locals)
 - rust-lang#110694 (Implement builtin # syntax and use it for offset_of!(...))
 - rust-lang#111120 (Suggest let for possible binding with ty)
 - rust-lang#111252 (Min specialization improvements)
 - rust-lang#111361 (Update books)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -603,6 +603,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session) {
     gate_all!(yeet_expr, "`do yeet` expression is experimental");
     gate_all!(dyn_star, "`dyn*` trait objects are experimental");
     gate_all!(const_closures, "const closures are experimental");
+    gate_all!(builtin_syntax, "`builtin #` syntax is unstable");
 
     if !visitor.features.negative_bounds {
         for &span in spans.get(&sym::negative_bounds).iter().copied().flatten() {

compiler/rustc_ast_pretty/src/pprust/state/expr.rs

@@ -556,8 +556,7 @@ impl<'a> State<'a> {
                 self.pclose();
             }
             ast::ExprKind::OffsetOf(container, fields) => {
-                // FIXME: This should have its own syntax, distinct from a macro invocation.
-                self.word("offset_of!");
+                self.word("builtin # offset_of");
                 self.popen();
                 self.rbox(0, Inconsistent);
                 self.print_type(container);