I was playing with the new :(attr) pathspecs in the upcoming v2.13 today, and noticed: $ git ls-files -- ':(attr:-diff)' t/t0110/url-1 t/t0110/url-10 [etc] So far so good. $ git ls-tree HEAD -- ':(attr:-diff)' fatal: :(attr:-diff): pathspec magic not supported by this command: 'attr' Bummer, but I understand that sometimes the options need to be plumbed through to work everywhere. $ git log HEAD -- ':(attr:-diff)' fatal: BUG:tree-walk.c:947: unsupported magic 40 Whoops. This is presumably ls-tree is protected, but I think we are missing a GUARD_PATHSPEC call somewhere. This isn't a huge deal, as the correct behavior is probably to die like ls-tree does, but we probably shouldn't be hitting BUG assertions as a general rule. -Peff