Fix test case to error when missing cacheResult flag

Author: q-ata

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

@@ -893,7 +893,7 @@ object Semantic:
 
               case Cold => Cold
 
-              case ref: Ref => eval(vdef.rhs, ref, enclosingClass)
+              case ref: Ref => eval(vdef.rhs, ref, enclosingClass, cacheResult = sym.is(Flags.Lazy))
 
               case _ =>
                  report.error("[Internal error] unexpected this value when accessing local variable, sym = " + sym.show + ", thisValue = " + thisValue2.show + Trace.show, Trace.position)

tests/init/pos/recursion.scala

@@ -0,0 +1,9 @@
+class A {
+  def foo(a: Int) = {
+    lazy val x: Int = if (a == 0) x else 0
+    println(x)
+  }
+  foo(0)
+
+  val y = 5
+}