Java: Preparatory tweaks.

java/ql/lib/semmle/code/java/Statement.qll

@@ -61,7 +61,7 @@ class Stmt extends StmtParent, ExprParent, @stmt {
 }
 
 /** A statement parent is any element that can have a statement as its child. */
-class StmtParent extends @stmtparent, Top { }
+class StmtParent extends @stmtparent, ExprParent { }
 
 /**
  * An error statement.

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

@@ -132,7 +132,7 @@ private module BaseSsaImpl {
       inner != outer and
       inner.getDeclaringType() = innerclass and
       result = parentDef(desugaredGetEnclosingType*(innerclass)) and
-      result.getEnclosingStmt().getEnclosingCallable() = outer and
+      result.getEnclosingCallable() = outer and
       capturedvar = TLocalVar(outer, v) and
       closurevar = TLocalVar(inner, v)
     )

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

@@ -115,7 +115,7 @@ private ControlFlowNode captureNode(TrackedVar capturedvar, TrackedVar closureva
     inner != outer and
     inner.getDeclaringType() = innerclass and
     result = parentDef(desugaredGetEnclosingType*(innerclass)) and
-    result.getEnclosingStmt().getEnclosingCallable() = outer and
+    result.getEnclosingCallable() = outer and
     capturedvar = TLocalVar(outer, v) and
     closurevar = TLocalVar(inner, v)
   )

java/ql/src/experimental/quantum/Examples/ArtifactReuse.qll

@@ -42,7 +42,7 @@ private DataFlow::Node getGeneratingWrapperSet(Crypto::NonceArtifactNode a) {
 }
 
 private predicate ancestorOfArtifact(
-  Crypto::ArtifactNode a, Callable enclosingCallable, ControlFlow::Node midOrTarget
+  Crypto::ArtifactNode a, Callable enclosingCallable, ControlFlowNode midOrTarget
 ) {
   a.asElement().(Expr).getEnclosingCallable() = enclosingCallable and
   (
@@ -87,7 +87,7 @@ predicate isArtifactReuse(Crypto::ArtifactNode a, Crypto::ArtifactNode b) {
       ancestorOfArtifact(b, commonParent, _)
     )
     implies
-    exists(Callable commonParent, ControlFlow::Node aMid, ControlFlow::Node bMid |
+    exists(Callable commonParent, ControlFlowNode aMid, ControlFlowNode bMid |
       ancestorOfArtifact(a, commonParent, aMid) and
       ancestorOfArtifact(b, commonParent, bMid) and
       a instanceof Crypto::NonceArtifactNode and