- report unused named import
- no given or wildcard import
- issue with method reference (e.g. apply, factory, ...)

Emits a warning when none of element of a wildcard ('_')
import is used (i.e. a "unused import" warning).

- Add various tests for unused warnings
- Fix warning not emitted when imported object is used
  another scope

- Emit warning for unused given imports
- Emit warning for wildcard imports when only given
  instances are used.
  ```
  import SomeGivenImports.given // OK
  import SomeGivenImports._ // error
  ```

- Add an `isRunnable` methode to the `CheckUnused` phase
  to avoid unecessary costly checks (suggested by @bishabosha)
- Move neg compilation tests out of folder

- Do not emit any warning for import exclusion.
- These are hard to interpret. These can be placed
  on purpose to avoid future usage of a symbol.

- Add a compiler settings for unused local definition
- Add check for unused local variable in CheckUnused phase
- Add some "neg-custom-args/fatal-warnings" checks for unused locals definition

- Add the "privates" option for "-Wunused"
- Implement "unused privates member" checks in "CheckUnused" phase
- Add a test suit for the previous point

- Fix the position of unused warning (unused locals, unused privates)
  to the declaration name. This avoids hidden overlapping warning

- Add warnings for unused parmaters (explicit, implicit)
- Add warnings for unused pattern variables (in match case)
- Add tests suits (fatal-warnings)

…to feature/linter/unused

- Fix minor changes
- Add more tests
- -Wunused:nowarn does not run the CheckUnused phase

fix nowarn

clean useless val

- Register annotation usage, so (i.e. @tailrec) is not reported
- Allow unsed self name (`self:A =>` members)
- Add tests suggested in the PR discussion thread

- Refactor the sets of defs and usage symbols.
  This results in less objects created and less push-pop scope.
- Fix false negative for imports in the same package

- Named import pointing to an implicit
- Given imports `import foo.bar.given`
- Add new tests, remove the ones on implicit reporting

- Check implicit and given imports
- Adapt check to some synthetic (@main, package object)
- Add new tests to support these features

- Annotated types are reported as used
- Some times class constructor "this" is used instead of apply
  It is registered as used
- Some new tests

- Reports more import alternatives (e.g. overloaded methods)

- overloaded where not well resolved and thus not reported
- also add a tests

…to feature/linter/unused

- Add the new -Wunused:strict-no-implicit-warn flag
- Add a test suit i15503j

- Tidy the code (space, newline,...)
- Refine the scope by making more things private
- Add explaination and doc comments (mostly to help reviewer)

- Add prepare and tranform method from MiniPhase
- Keep previous implementation for cases not covered
  by MiniPhase traversal (Mostly in the type tree)

- Does not report defs with @unused
- Update the test suit

- Params of method with trivial body are not reported as unused
- Update the test suit

- Wildcard import are reported before named ones
- Update the test suit

- Also add a (adapted) Scala 2 tests suits

- Method having a return type of "SingleType" (as named in Scala 2) are
  considered trivial (i.e. Nil, object X, object Y, None, ...)
- Update test suits

…to feature/linter/unused

- Suppress -Wunused:patvars
- Replace by -Wunused:unsafe-warn-patvars