From 9fb0591a17893eea81260351c6eb431e1fd83524 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Thu, 22 Aug 2024 15:16:18 -0700
Subject: [PATCH] Implement ToTokens for CStr and CString

---
 Cargo.toml                   |  2 +-
 src/to_tokens.rs             | 13 +++++++++++++
 tests/ui/not-quotable.stderr |  4 ++--
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index e284d22..d8ab242 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ repository = "https://github.com/dtolnay/quote"
 rust-version = "1.56"
 
 [dependencies]
-proc-macro2 = { version = "1.0.74", default-features = false }
+proc-macro2 = { version = "1.0.80", default-features = false }
 
 [dev-dependencies]
 rustversion = "1.0"
diff --git a/src/to_tokens.rs b/src/to_tokens.rs
index 726e434..660a9ec 100644
--- a/src/to_tokens.rs
+++ b/src/to_tokens.rs
@@ -3,6 +3,7 @@ use alloc::borrow::Cow;
 use alloc::rc::Rc;
 use core::iter;
 use proc_macro2::{Group, Ident, Literal, Punct, Span, TokenStream, TokenTree};
+use std::ffi::{CStr, CString};
 
 /// Types that can be interpolated inside a `quote!` invocation.
 ///
@@ -221,6 +222,18 @@ impl ToTokens for bool {
     }
 }
 
+impl ToTokens for CStr {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        tokens.append(Literal::c_string(self));
+    }
+}
+
+impl ToTokens for CString {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        tokens.append(Literal::c_string(self));
+    }
+}
+
 impl ToTokens for Group {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         tokens.append(self.clone());
diff --git a/tests/ui/not-quotable.stderr b/tests/ui/not-quotable.stderr
index 7bd2070..3196266 100644
--- a/tests/ui/not-quotable.stderr
+++ b/tests/ui/not-quotable.stderr
@@ -11,10 +11,10 @@ error[E0277]: the trait bound `Ipv4Addr: ToTokens` is not satisfied
             &'a T
             &'a mut T
             Box<T>
+            CStr
+            CString
             Cow<'a, T>
             Option<T>
             Rc<T>
-            RepInterp<T>
-            String
           and $N others
   = note: this error originates in the macro `quote` (in Nightly builds, run with -Z macro-backtrace for more info)