From 555b6d69b2420862388e36992d7e099625ca6fe4 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Fri, 17 Mar 2017 09:35:50 -0400
Subject: [PATCH] add some debug logs to type_variable.rs

---
 src/librustc/infer/type_variable.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/librustc/infer/type_variable.rs b/src/librustc/infer/type_variable.rs
index 9c8419d9546..5aab0fdf6c9 100644
--- a/src/librustc/infer/type_variable.rs
+++ b/src/librustc/infer/type_variable.rs
@@ -30,6 +30,7 @@ pub struct TypeVariableTable<'tcx> {
 }
 
 /// Reasons to create a type inference variable
+#[derive(Debug)]
 pub enum TypeVariableOrigin {
     MiscVariable(Span),
     NormalizeProjectionType(Span),
@@ -196,6 +197,7 @@ pub fn new_var(&mut self,
                    diverging: bool,
                    origin: TypeVariableOrigin,
                    default: Option<Default<'tcx>>,) -> ty::TyVid {
+        debug!("new_var(diverging={:?}, origin={:?})", diverging, origin);
         self.eq_relations.new_key(());
         let index = self.values.push(TypeVariableData {
             value: Bounded { relations: vec![], default: default },
@@ -203,7 +205,7 @@ pub fn new_var(&mut self,
             diverging: diverging
         });
         let v = ty::TyVid { index: index as u32 };
-        debug!("new_var() -> {:?}", v);
+        debug!("new_var: diverging={:?} index={:?}", diverging, v);
         v
     }