old.pp:
--------------------------------
[ Foo -- _1,
Foo -- KW["fred"]
]
--------------------------------
new.pp:
--------------------------------
[ Foo -- KW["fred"],
Foo -- _1
]
--------------------------------
pptable-diff invocation:
--------------------------------
martin@logistico:~> pptable-diff --old old.pp --new new.pp
Changed productions: ["Foo"]
--------------------------------