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diff --git a/vendor/wasm-bindgen-backend/src/lib.rs b/vendor/wasm-bindgen-backend/src/lib.rs
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index 000000000..d9262e857
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+++ b/vendor/wasm-bindgen-backend/src/lib.rs
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+//! A common backend for bindgen crates.
+//!
+//! This (internal) crate provides functionality common to multiple bindgen
+//! dependency crates. There are 4 main things exported from this crate:
+//!
+//! 1. [**`TryToTokens`**](./trait.TryToTokens.html)
+//!
+//!    Provides the ability to attempt conversion from an AST struct
+//!    into a TokenStream
+//!
+//! 2. [**`Diagnostic`**](./struct.Diagnostic.html)
+//!
+//!    A struct used to provide diagnostic responses for failures of said
+//!    tokenization
+//!
+//! 3. [**`ast`**](./ast/index.html)
+//!
+//!    Abstract Syntax Tree types used to represent a Rust program, with
+//!    the necessary metadata to generate bindings for it
+//!
+//! 4. [**`util`**](./util/index.html)
+//!
+//!    Common utilities for manipulating parsed types from syn
+//!
+
+#![recursion_limit = "256"]
+#![cfg_attr(feature = "extra-traits", deny(missing_debug_implementations))]
+#![deny(missing_docs)]
+#![doc(html_root_url = "https://docs.rs/wasm-bindgen-backend/0.2")]
+
+pub use crate::codegen::TryToTokens;
+pub use crate::error::Diagnostic;
+
+#[macro_use]
+mod error;
+
+pub mod ast;
+mod codegen;
+mod encode;
+pub mod util;