While compiling gcj on my mstermerge branch ( https://github.com/Zopolis4/gcj/tree/mstermerge) it breaks on, amongst other things, an internal compiler error: echo ../../../../gcj/libjava/classpath/lib/java/lang/ref/*.class > java/lang/ref.list echo ../../../../gcj/libjava/classpath/lib/java/lang/reflect/*.class > java/lang/reflect.list In file included from <built-in>:31: ../../../../gcj/libjava/java/lang/Object.java: internal compiler error: tree check: expected function_decl, have field_decl in layout_class_method, at java/class.cc:2627 In file included from <built-in>:63: java/lang/Object.java: internal compiler error: tree check: expected function_decl, have field_decl in layout_class_method, at java/class.cc:2627 I believe that this error is due to the following incorrect code at line 2589 at gcc/java/class.cc: for (tree method_decl = TYPE_FIELDS (this_class); Before it was removed, this line was: for (method_decl = TYPE_METHODS (this_class); But I have since modified it ( https://github.com/Zopolis4/gcj/commit/1f38bc896a704290ca0b742c60c60a88d5e1fb07#diff-bf49cdc948b20b9f25afd3fbb36922a10e979a55ff9600b3b51d0ec54175b752L2592) in accordance with 5aaa8fb40681ee66282d73dab8c8eccbf5ee0518 Given that this was incorrect, what would be the correct way to replace this instance of TYPE_METHODS? Were all my replacements of TYPE_METHODS in gcc/java/class.cc wrong?