So far, I have had a difficult time finding anything definitive on this
except for some rust test code.
fn main() {
// PART 1: works (from rust test code)
let asdf_fdsa = ~"<.<";
io::println(concat_idents!(asd, f_f, dsa));
io::println(stringify!(use_mention_distinction));
// PART 2: creating a function identifier
fn concat_idents!(foo, _, bar) () { // fails to compile
io::println("Foo!");
}
foo_bar();
// PART 3: a numeric is a bad identifier, but a good sub-identifier
let asdf3 = ~">.>";
io::println(concat_idents!(asdf, 3)); // fails to compile
}
The first part works fine.
The second part, creating a function identifier seems a perfectly valid
use-case, but fails compilation, and I don't know a valid work-around. I
have been unable to find a similar usage anywhere.
This third part was just some wishful thinking, actually, but if there are
ways to do this directly (other than changing "3" to a valid identifier
like "N3"), I would love to know.
(Though, this might not longer have much of a use case if/when generics
eventually support integral parameters.)
Ashish
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