finished ch20.3

.obsidian/workspace.json

@@ -21,6 +21,20 @@
               "title": "Advanced Features"
             }
           },
+          {
+            "id": "b24fe202609f5b35",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "Advanced Functions and Closures.md",
+                "mode": "source",
+                "source": false
+              },
+              "icon": "lucide-file",
+              "title": "Advanced Functions and Closures"
+            }
+          },
           {
             "id": "8efdb57e394f2650",
             "type": "leaf",
@@ -74,7 +88,7 @@
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           }
         ],
-        "currentTab": 2
+        "currentTab": 1
       }
     ],
     "direction": "vertical"
@@ -217,12 +231,13 @@
       "command-palette:Open command palette": false
     }
   },
-  "active": "74db89a42def0b8b",
+  "active": "b24fe202609f5b35",
   "lastOpenFiles": [
-    "Advanced Traits.md",
-    "Advanced Types.md",
-    "Unsafe Rust.md",
     "Advanced Features.md",
+    "Advanced Functions and Closures.md",
+    "Advanced Types.md",
+    "Advanced Traits.md",
+    "Unsafe Rust.md",
     "Pattern Matching.md",
     "Places Patterns Can Be Used.md",
     "Pattern Syntax.md",
@@ -244,7 +259,6 @@
     "Smart Pointers.md",
     "Simultaneous Code Running.md",
     "Passing Data Between Threads.md",
-    "Leaky Reference Cycles.md",
     "minigrep/src/lib.rs",
     "does_not_compile.svg",
     "Untitled.canvas",