No warning for unused "masking" import selector

[som-snytt]

Minimized code

//> using scala 3.7.2
//> using options -Wunused:imports

import scala.util.Try as _

@main def test = println:
  "hello, world"

Output

No warning.

Expectation

Warning.

[som-snytt]

https://github.com/scala/scala3/blob/3.7.2/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala#L644

// TODO check for unused masking import

[noti0na1]

If an import is masked, then shouldn't we ignore it? 🧐

[som-snytt]

The definition of "used" in the PR is "import has a wildcard and selector was consulted for the masked name".

Arguably, warning about imports was useful in Scala 2 because "I thought I imported some implicits but did not."

Import suggestions is more helpful in Scala 3; perhaps that could be supplemented with an audit of what was resolved by each import (for head scratchers). The audit could include root import overrides.