Multidimensional arrays

[foxtran]

I opened #1661 and many folks thumbs it. I tried to implement some quantum chemistry (which is performance-critical) code and look which features are required for it. Here, it is my point of view how Carbon may became popular in HPC community in comparison with C++, which has a lot application, but new Fortran applications are born and growing nowadays.

[emillaine]

There's some related discussion about multidimensional arrays in the array type syntax proposal #1787, starting from here.

[jonmeow]

I relabeled this as a proposal because its only content is a proposal file. After a closer look, I see it's been a few weeks and geoffromer's requests for more explanation haven't been addressed. I've converted this back to draft so that you have time to address comments and add more detail to the proposal.

[jonmeow]

Note, if you have any questions, #proposal-prs-and-process on Discord may be a good place to discuss proposal writing.

[github-actions[bot]]

We triage inactive PRs and issues in order to make it easier to find active work. If this PR should remain active, please comment or remove the inactive label. This PR is labeled inactive because the last activity was over 90 days ago. This PR will be closed and archived after 14 additional days without activity.

[github-actions[bot]]

We triage inactive PRs and issues in order to make it easier to find active work. If this PR should remain active or becomes active again, please reopen it. This PR was closed and archived because there has been no new activity in the 14 days since the inactive label was added.