Evil commands, deprecated, was Ev, concat etc

I guess that the use of '' should be restricted to the following situation..

You have just computed a messy expression involving variables x, y, z,  say.
You decide that you'd like to make that into the body of a function.  
You can do it
like this:

f(x,y,z):=''%

I think that any other use is evil.

Though even  that command could be done by define(f(x,y,z), %).

My opinion, anyway.
RJF
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