Remove cfg-if dependency.

We use it so little that it's not worth it.

Cargo.lock

@@ -35,7 +35,6 @@ version = "0.55.1"
 dependencies = [
  "bitflags",
  "cexpr",
- "cfg-if 1.0.0",
  "clang-sys",
  "clap",
  "diff",

Cargo.toml

@@ -47,7 +47,6 @@ shlex = "0.1"
 [dependencies]
 bitflags = "1.0.3"
 cexpr = "0.4"
-cfg-if = "1"
 # This kinda sucks: https://github.com/rust-lang/cargo/issues/1982
 clap = { version = "2", optional = true }
 clang-sys = { version = "1", features = ["clang_6_0"] }

src/ir/item.rs

@@ -101,24 +101,23 @@ pub trait ItemAncestors {
     fn ancestors<'a>(&self, ctx: &'a BindgenContext) -> ItemAncestorsIter<'a>;
 }
 
-cfg_if! {
-    if #[cfg(testing_only_extra_assertions)] {
-        type DebugOnlyItemSet = ItemSet;
-    } else {
-        struct DebugOnlyItemSet;
+#[cfg(testing_only_extra_assertions)]
+type DebugOnlyItemSet = ItemSet;
 
-        impl DebugOnlyItemSet {
-            fn new() -> Self {
-                DebugOnlyItemSet
-            }
+#[cfg(not(testing_only_extra_assertions))]
+struct DebugOnlyItemSet;
 
-            fn contains(&self, _id: &ItemId) -> bool {
-                false
-            }
-
-            fn insert(&mut self, _id: ItemId) {}
-        }
+#[cfg(not(testing_only_extra_assertions))]
+impl DebugOnlyItemSet {
+    fn new() -> Self {
+        DebugOnlyItemSet
     }
+
+    fn contains(&self, _id: &ItemId) -> bool {
+        false
+    }
+
+    fn insert(&mut self, _id: ItemId) {}
 }
 
 /// An iterator over an item and its ancestors.
@@ -132,7 +131,7 @@ impl<'a> ItemAncestorsIter<'a> {
     fn new<Id: Into<ItemId>>(ctx: &'a BindgenContext, id: Id) -> Self {
         ItemAncestorsIter {
             item: id.into(),
-            ctx: ctx,
+            ctx,
             seen: DebugOnlyItemSet::new(),
         }
     }

src/lib.rs

@@ -18,9 +18,6 @@
 #[macro_use]
 extern crate bitflags;
 #[macro_use]
-#[allow(unused_extern_crates)]
-extern crate cfg_if;
-#[macro_use]
 extern crate lazy_static;
 #[macro_use]
 extern crate quote;
@@ -44,14 +41,10 @@ mod extra_assertions;
 // we don't expose internals to library consumers.
 macro_rules! doc_mod {
     ($m:ident, $doc_mod_name:ident) => {
-        cfg_if! {
-            if #[cfg(feature = "testing_only_docs")] {
-                pub mod $doc_mod_name {
-                    //! Autogenerated documentation module.
-                    pub use super::$m::*;
-                }
-            } else {
-            }
+        #[cfg(feature = "testing_only_docs")]
+        pub mod $doc_mod_name {
+            //! Autogenerated documentation module.
+            pub use super::$m::*;
         }
     };
 }