From 8569dd1db985509cd235fafdd962aa52ced68e35 Mon Sep 17 00:00:00 2001
From: ben <benlewisj@gmail.com>
Date: Thu, 10 Oct 2019 22:01:55 +1300
Subject: [PATCH] Preserve output of raw pointers in mir dump.

---
 src/librustc/mir/mod.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/librustc/mir/mod.rs b/src/librustc/mir/mod.rs
index 2b5212cb7efaa..9ac1465cb0ba9 100644
--- a/src/librustc/mir/mod.rs
+++ b/src/librustc/mir/mod.rs
@@ -2602,7 +2602,14 @@ impl<'tcx> Debug for Constant<'tcx> {
 impl<'tcx> Display for Constant<'tcx> {
     fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
         write!(fmt, "const ")?;
-        write!(fmt, "{}", self.literal)
+        // FIXME make the default pretty printing of raw pointers more detailed. Here we output the
+        // debug representation of raw pointers, so that the raw pointers in the mir dump output are
+        // detailed and just not '{pointer}'.
+        if let ty::RawPtr(_) = self.literal.ty.kind {
+            write!(fmt, "{:?} : {}", self.literal.val, self.literal.ty)
+        } else {
+            write!(fmt, "{}", self.literal)
+        }
     }
 }