switch to petgraph 0.8.1 now that my PR was merged and released to crates.io

Cargo.lock

@@ -298,7 +298,7 @@ dependencies = [
  "eyre",
  "fayalite-proc-macros",
  "fayalite-visit-gen",
- "hashbrown 0.15.2",
+ "hashbrown",
  "jobslot",
  "num-bigint",
  "num-traits",
@@ -392,12 +392,6 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
 
-[[package]]
-name = "hashbrown"
-version = "0.14.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
-
 [[package]]
 name = "hashbrown"
 version = "0.15.2"
@@ -432,12 +426,12 @@ checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
 
 [[package]]
 name = "indexmap"
-version = "2.5.0"
+version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68b900aa2f7301e21c36462b170ee99994de34dff39a4a6a528e80e7376d07e5"
+checksum = "cea70ddb795996207ad57735b50c5982d8844f38ba9ee5f1aedcfb708a2aa11e"
 dependencies = [
  "equivalent",
- "hashbrown 0.14.3",
+ "hashbrown",
  "serde",
 ]
 
@@ -525,11 +519,14 @@ dependencies = [
 
 [[package]]
 name = "petgraph"
-version = "0.6.5"
-source = "git+https://github.com/programmerjake/petgraph.git?rev=258ea8071209a924b73fe96f9f87a3b7b45cbc9f#258ea8071209a924b73fe96f9f87a3b7b45cbc9f"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a98c6720655620a521dcc722d0ad66cd8afd5d86e34a89ef691c50b7b24de06"
 dependencies = [
  "fixedbitset",
+ "hashbrown",
  "indexmap",
+ "serde",
 ]
 
 [[package]]

Cargo.toml

@@ -29,8 +29,7 @@ jobslot = "0.2.19"
 num-bigint = "0.4.6"
 num-traits = "0.2.16"
 os_pipe = "1.2.1"
-# TODO: switch back to crates.io once petgraph accepts PR #684 and releases a new version
-petgraph = { git = "https://github.com/programmerjake/petgraph.git", rev = "258ea8071209a924b73fe96f9f87a3b7b45cbc9f" }
+petgraph = "0.8.1"
 prettyplease = "0.2.20"
 proc-macro2 = "1.0.83"
 quote = "1.0.36"

crates/fayalite/src/sim.rs

@@ -1022,6 +1022,16 @@ impl VisitMap<AssignmentOrSlotIndex> for AssignmentsVisitMap {
             AssignmentOrSlotIndex::BigSlot(slot) => self.slots.contains(slot),
         }
     }
+
+    fn unvisit(&mut self, n: AssignmentOrSlotIndex) -> bool {
+        match n {
+            AssignmentOrSlotIndex::AssignmentIndex(assignment_index) => {
+                mem::replace(&mut self.assignments[assignment_index], false)
+            }
+            AssignmentOrSlotIndex::SmallSlot(slot) => self.slots.remove(slot),
+            AssignmentOrSlotIndex::BigSlot(slot) => self.slots.remove(slot),
+        }
+    }
 }
 
 impl Visitable for Assignments {