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Backport "Fix false positive in WUnused for renamed path-dependent imports (2)" to LTS #20690

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merged 1 commit into from
Jun 20, 2024
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Backport "Fix false positive in WUnused for renamed path-dependent imports (2)" to LTS #20690

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6 changes: 3 additions & 3 deletions compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -337,7 +337,7 @@ object CheckUnused:
* - usage
*/
private class UnusedData:
import collection.mutable.{Set => MutSet, Map => MutMap, Stack => MutStack}
import collection.mutable.{Set => MutSet, Map => MutMap, Stack => MutStack, ListBuffer => MutList}
import UnusedData.*

/** The current scope during the tree traversal */
Expand All @@ -346,7 +346,7 @@ object CheckUnused:
var unusedAggregate: Option[UnusedResult] = None

/* IMPORTS */
private val impInScope = MutStack(MutSet[tpd.Import]())
private val impInScope = MutStack(MutList[tpd.Import]())
/**
* We store the symbol along with their accessibility without import.
* Accessibility to their definition in outer context/scope
Expand Down Expand Up @@ -449,7 +449,7 @@ object CheckUnused:
def pushScope(newScopeType: ScopeType): Unit =
// unused imports :
currScopeType.push(newScopeType)
impInScope.push(MutSet())
impInScope.push(MutList())
usedInScope.push(MutSet())

def registerSetVar(sym: Symbol): Unit =
Expand Down
10 changes: 10 additions & 0 deletions tests/pos/i18366.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
//> using options -Xfatal-warnings -Wunused:all

trait Builder {
def foo(): Unit
}

def repro =
val builder: Builder = ???
import builder.{foo => bar}
bar()
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