Rollup merge of #116811 - narpfel:unpretty-unicode-escape-in-format-string-literal, r=Nilstrieb

Preserve unicode escapes in format string literals when pretty-printing AST

Fixes #116799

Thanks to `@Nilstrieb` for the pointer to the correct location, that was really helpful for someone unfamiliar with the codebase.

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_ast_pretty/src/pprust/state/expr.rs b/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
index 1142d492160..269cb8f2380 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
@@ -684,8 +684,8 @@ pub fn reconstruct_format_args_template_string(pieces: &[FormatArgsPiece]) -> St
     for piece in pieces {
         match piece {
             FormatArgsPiece::Literal(s) => {
-                for c in s.as_str().escape_debug() {
-                    template.push(c);
+                for c in s.as_str().chars() {
+                    template.extend(c.escape_debug());
                     if let '{' | '}' = c {
                         template.push(c);
                     }