quickstart remove compile error (#172)

README.md

@@ -64,6 +64,10 @@ crate-type = [
                   # such as integration `tests/`, doctests, and `examples/`
 ]
 
+[[bin]]
+name = "generate-headers"
+required-features = ["headers"]  # Do not build unless generating headers.
+
 [dependencies]
 # Use `cargo add` or `cargo search` to find the latest values of x.y.z.
 # For instance:

guide/src/introduction/quickstart.md

@@ -32,6 +32,10 @@ crate-type = [
     "lib",        # For `generate-headers`, `examples/`, `tests/` etc.
 ]
 
+[[bin]]
+name = "generate-headers"
+required-features = ["headers"]  # Do not build unless generating headers.
+
 [dependencies]
 # Use `cargo add` or `cargo search` to find the latest values of x.y.z.
 # For instance:

guide/src/usage/lib-rs.md

@@ -81,18 +81,6 @@ file(name), or into the given `Write`-able / "write sink":
 
     to generate the headers.
 
-  - You may also want to add:
-
-    ```toml
-    # Cargo.toml
-    [[bin]]
-    name = "generate-headers"
-    required-features = ["headers"]
-    ```
-
-    to your `Cargo.toml` to improve the error messages when the feature is
-    missing.
-
 <details>
 <summary>More advanced example (runtime-dependent header output)</summary>