Removing warnings for returns in secondary constructors

Author: EnzeXing

compiler/src/dotty/tools/dotc/transform/init/Objects.scala

@@ -711,7 +711,11 @@ object Objects:
           val tpl = cls.defTree.asInstanceOf[TypeDef].rhs.asInstanceOf[Template]
           extendTrace(cls.defTree) { eval(tpl, ref, cls, cacheResult = true) }
         else
-          extendTrace(ddef) { eval(ddef.rhs, ref, cls, cacheResult = true) }
+          extendTrace(ddef) {
+            Returns.installHandler(ctor)
+            eval(ddef.rhs, ref, cls, cacheResult = true)
+            Returns.popHandler(ctor)
+          }
       else
         // no source code available
         Bottom

tests/init-global/pos/secondary-constructor-return.scala

@@ -0,0 +1,12 @@
+class Foo (var x: Int) {
+  def this(a : Int, b : Int) = {
+    this(a + b)
+    return
+  }
+  val y = x
+}
+
+object A {
+  val a = new Foo(2, 3)
+  val b = a.y
+}