add a useful debug printout

nikomatsakis · nikomatsakis · commit 4632e3345b77 · 2019-03-12T10:52:29.000-04:00
diff --git a/src/librustc/traits/fulfill.rs b/src/librustc/traits/fulfill.rs
@@ -275,6 +275,8 @@ impl<'a, 'b, 'gcx, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'b, 'gcx,
                 self.selcx.infcx().resolve_type_vars_if_possible(&obligation.predicate);
         }
 
+        debug!("process_obligation: obligation = {:?}", obligation);
+
         match obligation.predicate {
             ty::Predicate::Trait(ref data) => {
                 let trait_obligation = obligation.with(data.clone());

Original file line number	Diff line number	Diff line change
`@@ -275,6 +275,8 @@ impl<'a, 'b, 'gcx, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'b, 'gcx,`
`275`	`275`	`self.selcx.infcx().resolve_type_vars_if_possible(&obligation.predicate);`
`276`	`276`	`}`
`277`	`277`
	`278`	`+ debug!("process_obligation: obligation = {:?}", obligation);`
	`279`	`+`
`278`	`280`	`match obligation.predicate {`
`279`	`281`	`ty::Predicate::Trait(ref data) => {`
`280`	`282`	`let trait_obligation = obligation.with(data.clone());`