Slightly improve diagnostic impl+output for uncovered type parameters#157677
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fmease wants to merge 2 commits into
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Slightly improve diagnostic impl+output for uncovered type parameters#157677fmease wants to merge 2 commits into
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Moreover, don't add the error code to the lint warning(!). While helpful, it's quite unconventional.
The diagnostic is generally very noisy.
This commit tries to make it slightly less cluttered and more legible by
1. stopping to reuse the lengthy primary message as the primary label.
This duplication didn't increase the information content and only
turned the diagnostic into a letter and symbol soup.
Instead, we now pick a succinct label ("uncovered type parameter")
that immediately(!) signals to the users in red what is wrong with
the highlighted type parameter.
2. breaking some information-dense notes into multiple lines.
Finally, this rephrases the slightly awkward and confusing
"type parameter […] must be used as a type parameter for […] type" to
"type parameter […] must be used as an argument to […] type".
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Split out of PR #135910. No behavioral changes.
See individual commit messages for details.