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Improve -Wunused:locals,privates by tracking use of vars (if set or not) #16639

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PaulCoral opened this issue Jan 9, 2023 · 0 comments · Fixed by #17160
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Improve -Wunused:locals,privates by tracking use of vars (if set or not) #16639

PaulCoral opened this issue Jan 9, 2023 · 0 comments · Fixed by #17160
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area:linting Linting warnings enabled with -W or -Xlint itype:enhancement
Milestone
3.3.1

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@PaulCoral
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In merged PR #16157, -Wunused:locals -Wunused:privates only checks if the definitions are used (read).

As suggested in the mentioned PR, the idea would be to improve these warnings as in Scala 2 -Ywarn-unused:<args> and to track also whether vars are set or not, see this Scala 2 test example.
@prolativ prolativ added itype:enhancement area:reporting Error reporting including formatting, implicit suggestions, etc labels Jan 9, 2023
@jchyb jchyb added area:linting Linting warnings enabled with -W or -Xlint and removed area:reporting Error reporting including formatting, implicit suggestions, etc labels Feb 12, 2023
@schuetzcarl schuetzcarl mentioned this issue Mar 28, 2023
Merged
@anatoliykmetyuk anatoliykmetyuk linked a pull request Apr 4, 2023 that will close this issue
Improve -Wunused: locals, privates with unset vars warning #16639 #17160
Merged
szymon-rd added a commit that referenced this issue May 16, 2023
@szymon-rd
Improve -Wunused: locals, privates with unset vars warning #16639 (#1…
937b91c 
…7160)

This PR is related to my Bachelor Semester Project, supervised by
@anatoliykmetyuk.

The latter consist in improving and implementing more Scala 3 linter
options (see #15503), with #16639 as a starting issue fixed in this PR.

- During the traversal in CheckUnused.scala (Miniphase & local
TreeTraverser), when reaching an `Assign` case, symbols are collected as
set, and then used to filter used locals and privates variable at
reporting time.
- Adapt test suit, and Add more test accordingly.
- Note that for a same variable the unused warning always has priority
and shadows the unset warning.

That feature follows the Scala 2 `-Ywarn-unused:<args>` behavior.
@Kordyjan Kordyjan added this to the 3.3.1 milestone Aug 1, 2023
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area:linting Linting warnings enabled with -W or -Xlint itype:enhancement
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Improve -Wunused: locals, privates with unset vars warning #16639 schuetzcarl/dotty
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@prolativ @Kordyjan @PaulCoral @jchyb