Why does signaling an error not call set-message-function?

[Mario Lang]

Hi.

I just realized that only a certain type of message goes through
`set-message-function'.  In particular, things like

(signal 'end-of-buffer nil)

write to the echo area but do not trigger set-message-function.

This is a bit unexpected.  Is there an equivalent hook for
error messages going to the echo area?

-- 
CYa,
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