diff --git a/.vscode/launch.json b/.vscode/launch.json
deleted file mode 100644
index 1055452..0000000
--- a/.vscode/launch.json
+++ /dev/null
@@ -1,64 +0,0 @@
-{
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "type": "lldb",
-            "request": "launch",
-            "name": "Debug unit tests in library 'szun'",
-            "cargo": {
-                "args": [
-                    "test",
-                    "--no-run",
-                    "--lib",
-                    "--package=szun"
-                ],
-                "filter": {
-                    "name": "szun",
-                    "kind": "lib"
-                }
-            },
-            "args": [],
-            "cwd": "${workspaceFolder}"
-        },
-        {
-            "type": "lldb",
-            "request": "launch",
-            "name": "Debug executable 'main'",
-            "cargo": {
-                "args": [
-                    "build",
-                    "--bin=main",
-                    "--package=szun"
-                ],
-                "filter": {
-                    "name": "main",
-                    "kind": "bin"
-                }
-            },
-            "args": [],
-            "cwd": "${workspaceFolder}"
-        },
-        {
-            "type": "lldb",
-            "request": "launch",
-            "name": "Debug unit tests in executable 'main'",
-            "cargo": {
-                "args": [
-                    "test",
-                    "--no-run",
-                    "--bin=main",
-                    "--package=szun"
-                ],
-                "filter": {
-                    "name": "main",
-                    "kind": "bin"
-                }
-            },
-            "args": [],
-            "cwd": "${workspaceFolder}"
-        }
-    ]
-}
\ No newline at end of file
diff --git a/README.md b/README.md
index 6262438..b82848f 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ Type building functions are used to generate identifiers used in the constructio
 * `schema()`
 
 #### Example
-This example produces an identifier representing block of 4 bytes, which can be used to construct a list containing that type.
+This example produces an identifier representing a block of 4 bytes, which can be used to construct a list containing that type.
 ```
 let type_id = block(4);
 let list = List::new(type_id);
@@ -164,7 +164,7 @@ let target = Sequence::new();
 println!("{}", original.get());  // prints "Hello, world!"
 println!("{}", target.get());    // prints ""
 
-transfer(target, original);
+transfer(target, original).ok();
 
 println!("{}", original.get());  // prints ""
 println!("{}", target.get());    // prints "Hello, world!"
@@ -182,7 +182,7 @@ let target = Sequence::new();
 println!("{}", original.get());  // prints "Hello, world!"
 println!("{}", target.get());    // prints ""
 
-copy(target, original);
+copy(target, original).ok();
 
 println!("{}", original.get());  // prints "Hello, world!"
 println!("{}", target.get());    // prints "Hello, world!"