docs(ref): Remove dead example

This was missed in the migration to the reference being on docs.rs.  Not
feeling its worth finding a way to integrate it into the new structure.

Cargo.toml

@@ -350,11 +350,6 @@ path = "examples/tutorial_derive/05_01_assert.rs"
 required-features = ["derive"]
 test = true
 
-[[example]]
-name = "custom-bool"
-path = "examples/derive_ref/custom-bool.rs"
-required-features = ["derive"]
-
 [[example]]
 name = "interop_augment_args"
 path = "examples/derive_ref/augment_args.rs"

examples/derive_ref/custom-bool.md

@@ -1,44 +0,0 @@
-*Jump to [source](custom-bool.rs)*
-
-Example of overriding the magic `bool` behavior
-
-```console
-$ custom-bool --help
-A simple to use, efficient, and full-featured Command Line Argument Parser
-
-Usage: custom-bool[EXE] [OPTIONS] --foo <FOO> <BOOM>
-
-Arguments:
-  <BOOM>  [possible values: true, false]
-
-Options:
-      --foo <FOO>  [possible values: true, false]
-      --bar <BAR>  [default: false]
-  -h, --help       Print help information
-  -V, --version    Print version information
-
-$ custom-bool
-? failed
-error: The following required arguments were not provided:
-  --foo <FOO>
-  <BOOM>
-
-Usage: custom-bool[EXE] --foo <FOO> <BOOM>
-
-For more information try '--help'
-
-$ custom-bool --foo true false
-[examples/derive_ref/custom-bool.rs:31] opt = Opt {
-    foo: true,
-    bar: false,
-    boom: false,
-}
-
-$ custom-bool --foo true --bar true false
-[examples/derive_ref/custom-bool.rs:31] opt = Opt {
-    foo: true,
-    bar: true,
-    boom: false,
-}
-
-```

examples/derive_ref/custom-bool.rs

@@ -1,32 +0,0 @@
-use clap::Parser;
-
-#[derive(Parser, Debug, PartialEq)]
-#[command(author, version, about, long_about = None)]
-struct Opt {
-    // Default parser for `Set` is FromStr::from_str.
-    // `impl FromStr for bool` parses `true` or `false` so this
-    // works as expected.
-    #[arg(long, action = clap::ArgAction::Set)]
-    foo: bool,
-
-    // Of course, this could be done with an explicit parser function.
-    #[arg(long, action = clap::ArgAction::Set, value_parser = true_or_false, default_value_t)]
-    bar: bool,
-
-    // `bool` can be positional only with explicit `action` annotation
-    #[arg(action = clap::ArgAction::Set)]
-    boom: bool,
-}
-
-fn true_or_false(s: &str) -> Result<bool, &'static str> {
-    match s {
-        "true" => Ok(true),
-        "false" => Ok(false),
-        _ => Err("expected `true` or `false`"),
-    }
-}
-
-fn main() {
-    let opt = Opt::parse();
-    dbg!(opt);
-}

src/_derive/mod.rs

@@ -265,7 +265,6 @@
 //!
 //! Notes:
 //! - For custom type behavior, you can override the implied attributes/settings and/or set additional ones
-//!   - For example, see [custom-bool](./custom-bool.md)
 //! - `Option<Vec<T>>` will be `None` instead of `vec![]` if no arguments are provided.
 //!   - This gives the user some flexibility in designing their argument, like with `min_values(0)`
 //!