libproc_macro: Implement Display for Punct

Implement the Display trait for the rust internal Punct structure.

ChangeLog:

	* librust/proc_macro/rust/bridge/punct.rs: Implement Display.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/librust/proc_macro/rust/bridge/punct.rs b/librust/proc_macro/rust/bridge/punct.rs
index 20b03c5..f5f76b1 100644
--- a/librust/proc_macro/rust/bridge/punct.rs
+++ b/librust/proc_macro/rust/bridge/punct.rs
@@ -1,4 +1,6 @@
 use bridge::span::Span;
+use std::convert::TryFrom;
+use std::fmt;
 use Spacing;
 
 #[repr(C)]
@@ -24,3 +26,12 @@ impl Punct {
         let _ = span;
     }
 }
+
+impl fmt::Display for Punct {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Spacing::Alone = self.spacing {
+            f.write_str(" ")?;
+        }
+        char::try_from(self.ch).unwrap().fmt(f)
+    }
+}