Why I can't set what parameters are mutable explicitly?

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Great suggestion. Shouldn’t it be possible then to write a small macro @immutable that would be used as in the following?

function fun(a::AbstractVector, b::Real, c::AbstractVector)
    @immutable a c
    # From here on in the function, a and c are immutable
end

where the code generated by the macro would do something like the following:

a_orig = a  # Or preferably gensym a random name
a = ReadOnlyArray(a_orig)
# and the same for c

Your thoughts?

Note: I didn’t supply actual code for the macro since my macro-foo is pretty weak. I could work out the correct code eventually, but hoping for you or some other wizard to whip it up in a few seconds.

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