Implement Debug for InternedStr (#1760)

commit-id:919c7f28

---

**Stack**:
- #1749
- #1748
- #1745
- #1747
- #1760 ⬅


⚠️ *Part of a stack created by [spr](https://github.com/ejoffe/spr). Do
not merge manually using the UI - doing so may have unexpected results.*

plugins/cairo-lang-macro/src/types/token.rs

@@ -1,6 +1,6 @@
 use crate::CONTEXT;
 use bumpalo::Bump;
-use std::fmt::Display;
+use std::fmt::{Debug, Display, Write};
 use std::hash::{Hash, Hasher};
 use std::ops::Deref;
 use std::rc::Rc;
@@ -132,13 +132,21 @@ impl Token {
 /// and a guard which keeps the buffer alive.
 /// This way we do not need to allocate a new string,
 /// but also do not need to worry about the lifetime of the string.
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 pub struct InternedStr {
     ptr: *const str,
     // Holding a rc to the underlying buffer, so that ptr will always point to valid memory.
     _bump: Rc<BumpWrap>,
 }
 
+impl Debug for InternedStr {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_char('"')?;
+        f.write_str(self.as_ref())?;
+        f.write_char('"')
+    }
+}
+
 impl InternedStr {
     #[allow(private_interfaces)]
     #[doc(hidden)]