Fix world age warnings from accessing binding before definiton

[nickrobinson251]

Close #107

This warning is only present starting in Julia 1.12

Presumably the issue is with the docstring resolving the binding fnname before it's actually been defined. I don't fully understand the problem but this fixes it 🤷‍♂️

[NHDaly]

Ah, nice, thanks! Good find! It took me a minute of staring, but i think i've got an explanation:
It's easy to forget, but interpolating a symbol into an expression creates an identifier, not a symbol.
So this was generating the following string code:

"  $(trunc_mul)(I, x, y) :: I "

and as you point out, the trunc_mul function doesn't exist yet, so this should fail.

What we meant to be putting in there was the name of the function, as you've done, so your change looks great. 👍
The other thing we could have done is to generate what this code meant to be generating, which is this:

julia> "$(:foo)(I, x, y) :: I"
"foo(I, x, y) :: I"

That is, putting the symbol itself into the code, rather than using the symbol to put an identifier in the code.

The syntax to do that is to wrap the value in a QuoteNode, whose sole purpose it to allow putting symbols or expressions as values into generated code:

            $($(Meta.quot(fnname)))(I, x, y) :: I
            $($(QuoteNode(fnname)))(I, x, y) :: I

(either of those options are identical)

[NHDaly]

but anyway, i like what you've done - it's very straightforward.

[NHDaly]

in particular, the quote suggestion raises the question "how does a symbol stringify in interpolation? Does it print as foo or :foo?" so converting to a string is more clear 👍