But that failed, and then I tried a function that did (setq foo 42),
and that didn't seem to set foo.
I suspect diff-mode doesn't call diff-mode-hook.
The disassembled code says that it does. It uses run-mode-hooks.
Under some circumstances the running of those hooks can be delayed
till when a calling function exits, but that is supposed to occur
only if it is called from anothetr major mode.
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