AST-70: Eliminate 1-tuples

[rossberg]

No description provided.

[ggreif]

LGTM!

This is https://dfinity.atlassian.net/browse/AST-70 by the way, so you should prefix the pull request before merging.

Note: The source ranges change (in the right direction) in data-params.as, so you should make accept.

[crusso]

That's ok for the source, but do we need to rule them out in the IR as well?

[rossberg]

@crusso, do you mean adding some extra checks to check_ir?

[nomeata]

That's ok for the source, but do we need to rule them out in the IR as well?

I don’t think we need to rule it out: In the IR functions have an explicit arity, so there is no confusion, and we can support them just fine, and it might be useful for some transformations to be more uniform.

In any case, we can do that separately, if we want.

[crusso]

FIne by me.