Fix duplicate allocation printing.

src/eval_context.rs

@@ -200,7 +200,7 @@ pub(super) fn const_to_value(&mut self, const_val: &ConstVal) -> EvalResult<'tcx
             Struct(_)    => unimplemented!(),
             Tuple(_)     => unimplemented!(),
             Function(_)  => unimplemented!(),
-            Array(_)  => unimplemented!(),
+            Array(_)     => unimplemented!(),
             Repeat(_, _) => unimplemented!(),
         };
 

src/memory.rs

@@ -411,7 +411,6 @@ pub fn dump_allocs(&self, mut allocs: Vec<AllocId>) {
         let mut allocs_seen = HashSet::new();
 
         while let Some(id) = allocs_to_print.pop_front() {
-            allocs_seen.insert(id);
             if id == ZST_ALLOC_ID || id == NEVER_ALLOC_ID { continue; }
             let mut msg = format!("Alloc {:<5} ", format!("{}:", id));
             let prefix_len = msg.len();
@@ -433,7 +432,7 @@ pub fn dump_allocs(&self, mut allocs: Vec<AllocId>) {
 
             for i in 0..(alloc.bytes.len() as u64) {
                 if let Some(&target_id) = alloc.relocations.get(&i) {
-                    if !allocs_seen.contains(&target_id) {
+                    if allocs_seen.insert(target_id) {
                         allocs_to_print.push_back(target_id);
                     }
                     relocations.push((i, target_id));