Delayed quote expansion

I'm sure the answer to this will seem simple once I see it. Right now
it eludes me.

How can one have a string object like this...

a = '#{some_value}'

and have it get evaluated as a double quoted string (with the value for
some_value being automatically replaced) at a later time?

I would prefer that it is evaluated in context from which it is called.

I would like to do something like this...

def func(param)
test = 42
puts param.quote_substitution
end

func('my number is #{test}') #=> "my number is 42"

_Kevin

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