needless declarations (#2794)

* needless declarations

* fix build

* needless annotations

Author: tshepang

bindgen-integration/build.rs

@@ -1,5 +1,4 @@
 extern crate bindgen;
-extern crate cc;
 
 use bindgen::callbacks::{
     DeriveInfo, IntKind, MacroParsingBehavior, ParseCallbacks,

bindgen-integration/src/lib.rs

@@ -12,7 +12,6 @@ use std::ffi::CStr;
 use std::mem;
 use std::os::raw::c_int;
 
-#[allow(unused)]
 use bindings::testing::Bar; // This type is generated from module_raw_line.
 
 type MacroInteger = isize;

bindgen-tests/tests/expectations/tests/dynamic_loading_attributes.rs

@@ -14,8 +14,6 @@
 //! ```
 //!
 #![deny(missing_docs)]
-extern crate clap;
-extern crate quickchecking;
 
 use clap::{Arg, ArgAction, Command};
 use std::path::PathBuf;

bindgen-tests/tests/expectations/tests/dynamic_loading_required.rs

@@ -3,8 +3,6 @@
 //! ## Example
 //!
 //! ```rust
-//! extern crate quickcheck;
-//! extern crate quickchecking;
 //! use quickcheck::{Arbitrary, Gen};
 //! use quickchecking::fuzzers;
 //!
@@ -20,8 +18,6 @@
 #![deny(missing_docs)]
 #[macro_use]
 extern crate lazy_static;
-extern crate quickcheck;
-extern crate tempfile;
 
 use quickcheck::{Gen, QuickCheck, TestResult};
 use std::error::Error;

bindgen-tests/tests/expectations/tests/dynamic_loading_simple.rs

@@ -1,6 +1,3 @@
-extern crate quickcheck;
-extern crate quickchecking;
-
 use quickcheck::{Arbitrary, Gen};
 use quickchecking::fuzzers::{
     ArrayDimensionC, BaseTypeC, BasicTypeDeclarationC, DeclarationC,

bindgen-tests/tests/expectations/tests/dynamic_loading_template.rs

@@ -1,7 +1,3 @@
-// Don't want to copy that nasty `cfg` below...
-#[allow(unused_extern_crates)]
-extern crate bindgen;
-
 /// A sanity test that we can generate bindings for Stylo.
 ///
 /// We don't assert on expected output because its just too big. The output will

bindgen-tests/tests/expectations/tests/dynamic_loading_with_allowlist.rs

@@ -1,9 +1,3 @@
-extern crate bindgen;
-extern crate clap;
-#[cfg(feature = "logging")]
-extern crate env_logger;
-extern crate shlex;
-
 use bindgen::{clang_version, Builder};
 use owo_colors::{OwoColorize, Style};
 use similar::{ChangeTag, TextDiff};

bindgen-tests/tests/expectations/tests/dynamic_loading_with_blocklist.rs

@@ -90,8 +90,6 @@ impl DynamicItems {
         };
 
         quote! {
-            extern crate libloading;
-
             pub struct #lib_ident {
                 __library: ::libloading::Library,
                 #(#struct_members)*

bindgen-tests/tests/expectations/tests/dynamic_loading_with_class.rs

@@ -231,7 +231,6 @@ impl Default for RustFeatures {
 
 #[cfg(test)]
 mod test {
-    #![allow(unused_imports)]
     use super::*;
 
     #[test]

bindgen-tests/tests/expectations/tests/wrap_unsafe_ops_dynamic_loading_simple.rs

@@ -17,8 +17,6 @@ Given that the library has not been compiled yet, we need to modify the
 library:
 
 ```rust,ignore
-extern crate bindgen;
-
 use std::env;
 use std::path::PathBuf;