codegen: Use the canonical type to determine whether we should convert to a pointer an argument.

Fixes https://github.com/Yamakaky/rust-bindgen/issues/407

Author: emilio

libbindgen/src/codegen/mod.rs

@@ -1945,7 +1945,7 @@ impl ToRustTy for FunctionSig {
             //     the array type derivation.
             //
             // [1]: http://c0x.coding-guidelines.com/6.7.5.3.html
-            let arg_ty = if let TypeKind::Array(t, _) = *arg_ty.kind() {
+            let arg_ty = if let TypeKind::Array(t, _) = *arg_ty.canonical_type(ctx).kind() {
                 t.to_rust_ty(ctx).to_ptr(arg_ty.is_const(), ctx.span())
             } else {
                 arg_item.to_rust_ty(ctx)

libbindgen/tests/expectations/tests/typedefd-array-as-function-arg.rs

@@ -0,0 +1,10 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(non_snake_case)]
+
+
+pub type myVector3 = [f32; 3usize];
+extern "C" {
+    pub fn modifyVectorFunc(v: *mut f32);
+}

libbindgen/tests/headers/typedefd-array-as-function-arg.h

@@ -0,0 +1,3 @@
+// foo.h
+typedef float myVector3[3];
+void modifyVectorFunc(myVector3 v);