Ignore bridges when looking for the getter of a trait setter.

Author: sjrd

compiler/src/dotty/tools/dotc/transform/Memoize.scala

@@ -127,12 +127,12 @@ class Memoize extends MiniPhase with IdentityDenotTransformer { thisPhase =>
       val TraitSetterName(_, original) = sym.name
       val getterSimpleName = original.getterName
       val ownerInfo = sym.owner.info
-      val fastPath = ownerInfo.decl(getterSimpleName)
+      val fastPath = ownerInfo.findDecl(getterSimpleName, excluded = Bridge)
       if fastPath.exists then
         fastPath.symbol
       else
         ownerInfo.decls.find { getter =>
-          getter.is(Accessor) && getter.asTerm.name.toSimpleName == getterSimpleName
+          getter.is(Accessor, butNot = Bridge) && getter.asTerm.name.toSimpleName == getterSimpleName
         }
 
     val constantFinalVal = sym.isAllOf(Accessor | Final, butNot = Mutable) && tree.rhs.isInstanceOf[Literal]

tests/run/traitValBridge.scala

@@ -0,0 +1,18 @@
+class Foo
+
+trait GenericTrait[A] {
+  def bar: A
+}
+
+trait ConcreteTrait extends GenericTrait[Foo] {
+  val bar: Foo = new Foo
+}
+
+class ConcreteClass extends ConcreteTrait
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    val obj = new ConcreteClass
+    assert(obj.bar != null)
+  }
+}