The idea of this new Analyzer rule is to filter the calls of `map` before they are passed on to the classic ArrayInitRule which does the detailed checking of the lambda function block. The rule makes sure that only the `map` function is considered that is defined by the `Sequence` protocol.
By using SourceKit's `index` request to index the entire source file,
we can avoid having to make `cursor-info` requests for every candidate
token in the file, which scales linearly with the number of candiate
tokens.
For the Yams project, this approach improved the total SwiftLint run
time by 4.6x: 7.9 down from 36.8s.
The SourceKit index response doesn't have everything we need to identify
declarations, so we still need to make some `cursor-info` requests,
mostly to detect overrides: protocol conformances and parent class
overrides.
This approach ends up finding more unused declarations because the index
contains more declared USRs than can be found by calling `cursor-info`
on candidate tokens in a file.
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Remove unused declaration in ArrayInitRule
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Update package versions
* Add Example wrapper in order to display test failures inline when running in Xcode.
* Stop using Swift 5.1-only features so we can compile on Xcode 10.2.
* Wrap strings in Example.
* Add Changelog entry.
* Wrap all examples in Example struct.
* Better and more complete capturing of line numbers.
* Fix broken test.
* Better test traceability.
* Address or disable linting warnings.
* Add documentation comments.
* Disable linter for a few cases.
* Limit mutability and add copy-and-mutate utility functions.
* Limit scope of mutability.
JP Simard