The explanation of the make manual regarding to $(call

[ali hagigat]

8.6 The call Function
The call function expands the param arguments before assigning them to temporary
variables. This means that variable values containing references to
builtin functions that
have special expansion rules, like foreach or if, may not work as you expect.
Some examples may make this clearer.
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The above lines is talking about the expansion of 'param' before being
assigned to $(1), $(2) ...
And it says some examples makes it clearer. Where are the examples?
There is no example in relation with 'param' expansion!

I wonder if anybody could bring an example.