Rollup merge of #135943 - hkBst:opt_imports, r=estebank

Rename `Piece::String` to `Piece::Lit`

This renames Piece::String to Piece::Lit to avoid shadowing std::string::String and removes "pub use Piece::*;".

Author: fmease

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) => {