mdcat: fix compilation

pkgs/tools/text/mdcat/default.nix

@@ -22,6 +22,10 @@ rustPlatform.buildRustPackage rec {
     hash = "sha256-j6BFXx5cyjE3+fo1gGKlqpsxrm3i9HfQ9tJGNNjjLwo=";
   };
 
+  patches = [
+    ./fix-clippy.diff
+  ];
+
   nativeBuildInputs = [
     pkg-config
     asciidoctor

pkgs/tools/text/mdcat/fix-clippy.diff

@@ -0,0 +1,14 @@
+diff --git a/pulldown-cmark-mdcat/src/terminal/osc.rs b/pulldown-cmark-mdcat/src/terminal/osc.rs
+index 8fa2db6..dc2a2da 100644
+--- a/pulldown-cmark-mdcat/src/terminal/osc.rs
++++ b/pulldown-cmark-mdcat/src/terminal/osc.rs
+@@ -20,9 +20,6 @@ pub fn write_osc<W: Write + ?Sized>(writer: &mut W, command: &str) -> Result<()>
+     Ok(())
+ }
+ 
+-#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+-pub struct Osc8Links;
+-
+ /// Whether the given `url` needs to get an explicit host.
+ ///
+ /// [OSC 8] links require that `file://` URLs give an explicit hostname, as