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3559a48b8e
Make comma separated lists of anything easier to make for errors Provide a new function `listify`, meant to be used in cases similar to `pluralize!`. When you have a slice of arbitrary elements that need to be presented to the user, `listify` allows you to turn that into a list of comma separated strings. This reduces a lot of redundant logic that happens often in diagnostics.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.