Ruby: fix self variables in blocks

ruby/ql/lib/codeql/ruby/ast/internal/Variable.qll

@@ -676,7 +676,9 @@ private class SelfVariableAccessReal extends SelfVariableAccessImpl, TSelfReal {
   private SelfVariable var;
 
   SelfVariableAccessReal() {
-    exists(Ruby::Self self | this = TSelfReal(self) and var = TSelfVariable(scopeOf(self)))
+    exists(Ruby::Self self |
+      this = TSelfReal(self) and var = TSelfVariable(scopeOf(self).getEnclosingSelfScope())
+    )
   }
 
   final override SelfVariable getVariableImpl() { result = var }

ruby/ql/test/library-tests/controlflow/graph/Cfg.expected

@@ -3696,7 +3696,7 @@ cfg.rb:
 #-----|  -> exit filter_nil
 
 #  207| filter_nil
-#-----|  -> exit cfg.rb (normal)
+#-----|  -> self
 
 #  207| list
 #-----|  -> list
@@ -3733,6 +3733,35 @@ cfg.rb:
 #  209| call to nil?
 #-----|  -> exit do ... end (normal)
 
+#  213| call to do_something
+#-----|  -> exit cfg.rb (normal)
+
+#  213| self
+#-----|  -> do ... end
+
+#  213| do ... end
+#-----|  -> call to do_something
+
+#  213| enter do ... end
+#-----|  -> self
+
+#  213| exit do ... end
+
+#  213| exit do ... end (normal)
+#-----|  -> exit do ... end
+
+#  214| self
+#-----|  -> call to something
+
+#  214| call to something
+#-----|  -> self
+
+#  215| call to something_else
+#-----|  -> exit do ... end (normal)
+
+#  215| self
+#-----|  -> call to something_else
+
 desugar.rb:
 #    1| enter m1
 #-----|  -> x

ruby/ql/test/library-tests/controlflow/graph/Nodes.expected

@@ -44,6 +44,9 @@ callsWithNoArguments
 | cfg.rb:205:1:205:3 | call to foo |
 | cfg.rb:208:3:210:5 | call to reject |
 | cfg.rb:209:5:209:13 | call to nil? |
+| cfg.rb:213:1:216:3 | call to do_something |
+| cfg.rb:214:3:214:16 | call to something |
+| cfg.rb:215:3:215:16 | call to something_else |
 | desugar.rb:6:3:6:7 | call to foo |
 | desugar.rb:10:3:10:7 | call to foo |
 | desugar.rb:14:3:14:7 | call to foo |

ruby/ql/test/library-tests/controlflow/graph/cfg.rb

@@ -210,6 +210,11 @@ def filter_nil list
   end
 end
 
+do_something do
+  self.something
+  something_else
+end
+
 __END__
 
 Some ignored nonsense