[SR-4259] Request: fixit for import module casing

[NachoSoto]

Previous ID	SR-4259
Radar	None
Original Reporter	@NachoSoto
Type	Bug

Environment

Swift version 3.0.2 (swiftlang-800.0.63 clang-800.0.42.1)

Additional Detail from JIRA

| | | |------------------|-----------------| |Votes | 0 | |Component/s | Compiler | |Labels | Bug, DiagnosticsQoI, StarterBug | |Assignee | None | |Priority | Medium | md5: 24348ceb701412a7d44fffc88ff4e8c8

relates to:

• SR-9554 Improve diagnostic for naming a project after a system framework, case-insensitively

Issue Description:

`import UIKIt` (notice the capital I) fails with the error: "Cannot load module 'UIKit' as 'UIKIt'".

Expected behavior: it produces a fixit to correct this. I almost couldn't see what was wrong, since i and I are so similar.

[swift-ci]

Comment by Matthew Spear (JIRA)

Still trying out starter bugs and getting a feel for OS - will give it an attempt and release the issue / ask for help if I can't manage it!

[keith]

I've submitted a fix-it for this case here https://github.com/apple/swift/pull/18308

[belkadan]

Oops, looks like we didn't get this reviewed at the time and @keith went to work on other things. If anyone wants to pick it up, feel free!