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diff --git a/vendor/xflags/README.md b/vendor/xflags/README.md
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+[![API reference](https://docs.rs/once_cell/badge.svg)](https://docs.rs/xflags/)
+
+# xflags
+
+Moderately simple command line arguments parsing:
+
+```rust
+mod flags {
+    use std::path::PathBuf;
+
+    xflags::xflags! {
+        src "./examples/basic.rs"
+
+        cmd my-command
+            required path: PathBuf
+        {
+            optional -v, --verbose
+        }
+    }
+
+    // generated start
+    // The following code is generated by `xflags` macro.
+    // Run `env UPDATE_XFLAGS=1 cargo build` to regenerate.
+    #[derive(Debug)]
+    pub struct MyCommand {
+        pub path: PathBuf,
+
+        pub verbose: bool,
+    }
+
+    impl MyCommand {
+        pub const HELP: &'static str = Self::HELP_;
+
+        pub fn from_env() -> xflags::Result<Self> {
+            Self::from_env_()
+        }
+
+        pub fn from_vec(args: Vec<std::ffi::OsString>) -> xflags::Result<Self> {
+            Self::from_vec_(args)
+        }
+    }
+    // generated end
+}
+
+fn main() {
+    let flags = flags::MyCommand::from_env();
+    println!("{:#?}", flags);
+}
+```