3 files changed, 18 insertions, 2 deletions
diff --git a/compiler/rustc_builtin_macros/src/asm.rs b/compiler/rustc_builtin_macros/src/asm.rs
index 238cc14ff0b..5062cf55bb9 100644
--- a/compiler/rustc_builtin_macros/src/asm.rs
+++ b/compiler/rustc_builtin_macros/src/asm.rs
@@ -531,6 +531,7 @@ fn expand_preparsed_asm(
             symbol: template_str,
             style: template_style,
             span: template_span,
+            ..
         } = {
             let ExpandResult::Ready(mac) = expr_to_spanned_string(ecx, template_expr, msg) else {
                 return ExpandResult::Retry(());
diff --git a/compiler/rustc_builtin_macros/src/format.rs b/compiler/rustc_builtin_macros/src/format.rs
index 5b3f08948a9..0112499c509 100644
--- a/compiler/rustc_builtin_macros/src/format.rs
+++ b/compiler/rustc_builtin_macros/src/format.rs
@@ -166,7 +166,12 @@ fn make_format_args(
 
     let MacroInput { fmtstr: efmt, mut args, is_direct_literal } = input;
 
-    let ExprToSpannedString { symbol: fmt_str, span: fmt_span, style: fmt_style } = {
+    let ExprToSpannedString {
+        symbol: fmt_str,
+        span: fmt_span,
+        style: fmt_style,
+        uncooked_symbol: uncooked_fmt_str,
+    } = {
         let ExpandResult::Ready(mac) = expr_to_spanned_string(ecx, efmt.clone(), msg) else {
             return ExpandResult::Retry(());
         };
@@ -584,7 +589,12 @@ fn make_format_args(
         }
     }
 
-    ExpandResult::Ready(Ok(FormatArgs { span: fmt_span, template, arguments: args }))
+    ExpandResult::Ready(Ok(FormatArgs {
+        span: fmt_span,
+        template,
+        arguments: args,
+        uncooked_fmt_str,
+    }))
 }
 
 fn invalid_placeholder_type_error(
diff --git a/compiler/rustc_builtin_macros/src/util.rs b/compiler/rustc_builtin_macros/src/util.rs
index 9162e94eddb..38fec2bff14 100644
--- a/compiler/rustc_builtin_macros/src/util.rs
+++ b/compiler/rustc_builtin_macros/src/util.rs
@@ -63,6 +63,10 @@ pub(crate) struct ExprToSpannedString {
     pub symbol: Symbol,
     pub style: ast::StrStyle,
     pub span: Span,
+    /// The raw string literal, with no escaping or processing.
+    ///
+    /// Generally only useful for lints that care about the raw bytes the user wrote.
+    pub uncooked_symbol: (ast::token::LitKind, Symbol),
 }
 
 /// - `Ok` is returned when the conversion to a string literal is unsuccessful,
@@ -100,6 +104,7 @@ pub(crate) fn expr_to_spanned_string<'a>(
                     symbol: s,
                     style,
                     span: expr.span,
+                    uncooked_symbol: (token_lit.kind, token_lit.symbol),
                 }));
             }
             Ok(ast::LitKind::ByteStr(..)) => {