Java: Add toString for new ContentApprox elements

Author: paldepind

java/ql/lib/semmle/code/java/dataflow/internal/DataFlowPrivate.qll

@@ -757,6 +757,12 @@ class ContentApprox extends TContentApprox {
     or
     this = TSyntheticFieldApproxContent() and
     result = "approximated synthetic field"
+    or
+    this = TLambdaReturnContentApprox(_) and
+    result = "<lambda-return>"
+    or
+    this = TLambdaArgumentApprox(_, _) and
+    result = "<lambda-argument>"
   }
 }
 

java/ql/lib/semmle/code/java/dataflow/internal/DataFlowUtil.qll

@@ -378,7 +378,7 @@ class LambdaArgumentContent extends Content, TLambdaArgumentContent {
 
   override DataFlowType getType() { result = getErasedRepr(m.getParameter(pos).getType()) }
 
-  override string toString() { result = "<lambda-argument>" + pos.toString() }
+  override string toString() { result = "<lambda-argument> " + pos.toString() }
 }
 
 /**