Implement Display and Debug for the program point types.

lib/cretonne/src/ir/progpoint.rs

@@ -82,15 +82,28 @@ impl From<ProgramPoint> for ExpandedProgramPoint {
     }
 }
 
-impl fmt::Display for ProgramPoint {
+impl fmt::Display for ExpandedProgramPoint {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match (*self).into() {
+        match *self {
             ExpandedProgramPoint::Inst(x) => write!(f, "{}", x),
             ExpandedProgramPoint::Ebb(x) => write!(f, "{}", x),
         }
     }
 }
 
+impl fmt::Display for ProgramPoint {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let epp: ExpandedProgramPoint = (*self).into();
+        epp.fmt(f)
+    }
+}
+
+impl fmt::Debug for ExpandedProgramPoint {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "ExpandedProgramPoint({})", self)
+    }
+}
+
 impl fmt::Debug for ProgramPoint {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "ProgramPoint({})", self)