Add dyn to Write

diff --git a/src/librustdoc/html/highlight.rs b/src/librustdoc/html/highlight.rs
index 8a7aa3c13a95155d5f12dfea79d3e901326c2668..73d7a9ab8599d75015d62301eeb2c21e1cdddc3b 100644 (file)
--- a/src/librustdoc/html/highlight.rs
+++ b/src/librustdoc/html/highlight.rs
@@ -370,7 +370,7 @@ fn rustdoc_class(self) -> &'static str {
     }
 }
 
-fn write_header(class: Option<&str>, out: &mut Write) -> io::Result<()> {
+fn write_header(class: Option<&str>, out: &mut dyn Write) -> io::Result<()> {
     write!(out, "<pre class=\"rust {}\">\n", class.unwrap_or(""))
 }