codegen: Append implicit template parameters to base members.

Fixes #1514

src/codegen/mod.rs

@@ -1504,14 +1504,15 @@ impl CodeGenerator for CompInfo {
                     continue;
                 }
 
-                let inner = base.ty.to_rust_ty_or_opaque(ctx, &());
+                let inner_item = ctx.resolve_item(base.ty);
+                let mut inner = inner_item.to_rust_ty_or_opaque(ctx, &());
+                inner.append_implicit_template_params(ctx, &inner_item);
                 let field_name = ctx.rust_ident(&base.field_name);
 
-                let base_ty = ctx.resolve_type(base.ty);
-                struct_layout.saw_base(base_ty);
+                struct_layout.saw_base(inner_item.expect_type());
 
                 fields.push(quote! {
-                    pub #field_name : #inner ,
+                    pub #field_name: #inner,
                 });
             }
         }

tests/expectations/tests/issue-1514.rs

@@ -0,0 +1,36 @@
+/* automatically generated by rust-bindgen */
+
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
+
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct Thing {
+    pub _address: u8,
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct Thing_Inner<T> {
+    pub ptr: *mut T,
+    pub _phantom_0: ::std::marker::PhantomData<::std::cell::UnsafeCell<T>>,
+}
+impl<T> Default for Thing_Inner<T> {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct Thing_AnotherInner<T> {
+    pub _base: Thing_Inner<T>,
+    pub _phantom_0: ::std::marker::PhantomData<::std::cell::UnsafeCell<T>>,
+}
+impl<T> Default for Thing_AnotherInner<T> {
+    fn default() -> Self {
+        unsafe { ::std::mem::zeroed() }
+    }
+}

tests/headers/issue-1514.hpp

@@ -0,0 +1,9 @@
+template<typename T>
+struct Thing {
+    struct Inner {
+        T *ptr;
+    };
+
+    struct AnotherInner : Inner {
+    };
+};