diff --git a/src/librustc/mir/mod.rs b/src/librustc/mir/mod.rs
index f7ef542544cc..1e8dda0addf4 100644
--- a/src/librustc/mir/mod.rs
+++ b/src/librustc/mir/mod.rs
@@ -877,7 +877,7 @@ pub struct ValidationOperand<'tcx, T> {
 
 impl<'tcx, T: Debug> Debug for ValidationOperand<'tcx, T> {
     fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
-        write!(fmt, "{:?}@{:?}", self.lval, self.ty)?;
+        write!(fmt, "{:?}: {:?}", self.lval, self.ty)?;
         if let Some(ce) = self.re {
             // (reuse lifetime rendering policy from ppaux.)
             write!(fmt, "/{}", ty::ReScope(ce))?;
diff --git a/src/test/mir-opt/validate_1.rs b/src/test/mir-opt/validate_1.rs
index 558426fcde14..4a143c4cee9e 100644
--- a/src/test/mir-opt/validate_1.rs
+++ b/src/test/mir-opt/validate_1.rs
@@ -22,7 +22,7 @@ fn main() {
 // START rustc.node4.EraseRegions.after.mir
 // fn foo(_1: &ReErased mut i32) -> () {
 //     bb0: {
-//         Validate(Acquire, [_1@&ReFree(DefId { krate: CrateNum(0), node: DefIndex(3) => validate_1/8cd878b::foo[0] }, BrAnon(0)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(3) => validate_1/8cd878b::foo[0] }, BrAnon(0)) mut i32]);
 //         return;
 //     }
 // }
@@ -30,18 +30,18 @@ fn main() {
 // START rustc.node11.EraseRegions.after.mir
 // fn main() -> () {
 //     bb0: {
-//         Validate(Suspend(ReScope(Misc(NodeId(20)))), [_1@i32]);
+//         Validate(Suspend(ReScope(Misc(NodeId(20)))), [_1: i32]);
 //         _4 = &ReErased mut _1;
-//         Validate(Acquire, [(*_4)@i32/ReScope(Misc(NodeId(20)))]);
-//         Validate(Suspend(ReScope(Misc(NodeId(20)))), [(*_4)@i32/ReScope(Misc(NodeId(20)))]);
+//         Validate(Acquire, [(*_4): i32/ReScope(Misc(NodeId(20)))]);
+//         Validate(Suspend(ReScope(Misc(NodeId(20)))), [(*_4): i32/ReScope(Misc(NodeId(20)))]);
 //         _3 = &ReErased mut (*_4);
-//         Validate(Acquire, [(*_3)@i32/ReScope(Misc(NodeId(20)))]);
-//         Validate(Release, [_3@&ReScope(Misc(NodeId(20))) mut i32]);
+//         Validate(Acquire, [(*_3): i32/ReScope(Misc(NodeId(20)))]);
+//         Validate(Release, [_3: &ReScope(Misc(NodeId(20))) mut i32]);
 //         _2 = const foo(_3) -> bb1;
 //     }
 //
 //     bb1: {
-//         Validate(Acquire, [_2@()]);
+//         Validate(Acquire, [_2: ()]);
 //         EndRegion(ReScope(Misc(NodeId(20))));
 //         return;
 //     }
diff --git a/src/test/mir-opt/validate_2.rs b/src/test/mir-opt/validate_2.rs
index 21723739ca19..37ebd720d52d 100644
--- a/src/test/mir-opt/validate_2.rs
+++ b/src/test/mir-opt/validate_2.rs
@@ -19,9 +19,9 @@ fn main() {
 // START rustc.node4.EraseRegions.after.mir
 // fn main() -> () {
 //     bb1: {
-//         Validate(Release, [_2@std::boxed::Box<[i32; 3]>]);
+//         Validate(Release, [_2: std::boxed::Box<[i32; 3]>]);
 //         _1 = _2 as std::boxed::Box<[i32]> (Unsize);
-//         Validate(Acquire, [_1@std::boxed::Box<[i32]>]);
+//         Validate(Acquire, [_1: std::boxed::Box<[i32]>]);
 //     }
 // }
 // END rustc.node4.EraseRegions.after.mir
diff --git a/src/test/mir-opt/validate_3.rs b/src/test/mir-opt/validate_3.rs
index 88ae114c579a..100fae5c6781 100644
--- a/src/test/mir-opt/validate_3.rs
+++ b/src/test/mir-opt/validate_3.rs
@@ -32,13 +32,13 @@ fn main() {
 // fn main() -> () {
 //     let mut _5: &ReErased i32;
 //     bb0: {
-//         Validate(Suspend(ReScope(Misc(NodeId(46)))), [((*_2).0: i32)@i32/ReScope(Remainder(BlockRemainder { block: NodeId(18), first_statement_index: 3 })) (imm)]);
+//         Validate(Suspend(ReScope(Misc(NodeId(46)))), [((*_2).0: i32): i32/ReScope(Remainder(BlockRemainder { block: NodeId(18), first_statement_index: 3 })) (imm)]);
 //         _5 = &ReErased ((*_2).0: i32);
-//         Validate(Acquire, [(*_5)@i32/ReScope(Misc(NodeId(46))) (imm)]);
-//         Validate(Suspend(ReScope(Misc(NodeId(46)))), [(*_5)@i32/ReScope(Misc(NodeId(46))) (imm)]);
+//         Validate(Acquire, [(*_5): i32/ReScope(Misc(NodeId(46))) (imm)]);
+//         Validate(Suspend(ReScope(Misc(NodeId(46)))), [(*_5): i32/ReScope(Misc(NodeId(46))) (imm)]);
 //         _4 = &ReErased (*_5);
-//         Validate(Acquire, [(*_4)@i32/ReScope(Misc(NodeId(46))) (imm)]);
-//         Validate(Release, [_4@&ReScope(Misc(NodeId(46))) i32]);
+//         Validate(Acquire, [(*_4): i32/ReScope(Misc(NodeId(46))) (imm)]);
+//         Validate(Release, [_4: &ReScope(Misc(NodeId(46))) i32]);
 //         _3 = const foo(_4) -> bb1;
 //     }
 //     bb1: {