Auto merge of #136225 - fmease:rollup-fm7m744, r=fmease

Rollup of 7 pull requests

Successful merges:

 - #135625 ([cfg_match] Document the use of expressions.)
 - #135902 (Do not consider child bound assumptions for rigid alias)
 - #135943 (Rename `Piece::String` to `Piece::Lit`)
 - #136104 (Add mermaid graphs of NLL regions and SCCs to polonius MIR dump)
 - #136143 (Update books)
 - #136147 (ABI-required target features: warn when they are missing in base CPU)
 - #136164 (Refactor FnKind variant to hold &Fn)

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

Author: bors

crates/hir-def/src/body/lower/asm.rs

@@ -229,7 +229,7 @@ impl ExprCollector<'_> {
                     };
                     for piece in unverified_pieces {
                         match piece {
-                            rustc_parse_format::Piece::String(_) => {}
+                            rustc_parse_format::Piece::Lit(_) => {}
                             rustc_parse_format::Piece::NextArgument(arg) => {
                                 // let span = arg_spans.next();
 

crates/hir-def/src/hir/format_args.rs

@@ -287,7 +287,7 @@ pub(crate) fn parse(
 
     for piece in pieces {
         match piece {
-            parse::Piece::String(s) => {
+            parse::Piece::Lit(s) => {
                 unfinished_literal.push_str(s);
             }
             parse::Piece::NextArgument(arg) => {