[expressionsem.d] use nested function instead of goto

compiler/src/dmd/expressionsem.d

@@ -4113,6 +4113,11 @@ private extern (C++) final class ExpressionSemanticVisitor : Visitor
  ClassDeclaration cd;
  Dsymbol s;
 
+ void err()
+ {
+ error(e.loc, "`super` is only allowed in non-static class member functions");
+ result = ErrorExp.get();
+ }
  /* Special case for typeof(this) and typeof(super) since both
  * should work even if they are not inside a non-static member function
  */
@@ -4142,7 +4147,7 @@ private extern (C++) final class ExpressionSemanticVisitor : Visitor
  }
  }
  if (!fd)
- goto Lerr;
+ return err();
 
  e.var = fd.vthis;
  assert(e.var && e.var.parent);
@@ -4154,7 +4159,7 @@ private extern (C++) final class ExpressionSemanticVisitor : Visitor
  cd = s.isClassDeclaration();
  //printf("parent is %s %s\n", fd.toParent().kind(), fd.toParent().toChars());
  if (!cd)
- goto Lerr;
+ return err();
  if (!cd.baseClass)
  {
  error(e.loc, "no base class for `%s`", cd.toChars());
@@ -4170,11 +4175,6 @@ private extern (C++) final class ExpressionSemanticVisitor : Visitor
  return setError();
 
  result = e;
- return;
-
- Lerr:
- error(e.loc, "`super` is only allowed in non-static class member functions");
- result = ErrorExp.get();
  }
 
  override void visit(NullExp e)