Auto merge of #352 - emilio:auto, r=fitzgen

ir: Handle CXType_Auto.

Fixes #351

Author: bors-servo

libbindgen/src/ir/ty.rs

@@ -780,6 +780,15 @@ impl Type {
                     return Err(ParseError::Continue);
                 }
             }
+            CXType_Auto => {
+                // We don't want to blow the stack.
+                assert!(canonical_ty != *ty, "Couldn't find deduced type");
+                return Self::from_clang_ty(potential_id,
+                                           &canonical_ty,
+                                           location,
+                                           parent_id,
+                                           ctx);
+            }
             // NOTE: We don't resolve pointers eagerly because the pointee type
             // might not have been parsed, and if it contains templates or
             // something else we might get confused, see the comment inside

libbindgen/tests/expectations/tests/auto.rs

@@ -0,0 +1,20 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(non_snake_case)]
+
+
+#[repr(C)]
+#[derive(Debug, Copy)]
+pub struct Foo {
+    pub _address: u8,
+}
+pub const Foo_kBar: bool = true;
+#[test]
+fn bindgen_test_layout_Foo() {
+    assert_eq!(::std::mem::size_of::<Foo>() , 1usize);
+    assert_eq!(::std::mem::align_of::<Foo>() , 1usize);
+}
+impl Clone for Foo {
+    fn clone(&self) -> Self { *self }
+}

libbindgen/tests/headers/auto.hpp

@@ -0,0 +1,6 @@
+// bindgen-flags: -- -std=c++11
+// bindgen-unstable
+
+class Foo {
+  static constexpr auto kBar = 2 == 2;
+};