comment out is_symbol_referenced in internalcompiler

qlasskit/compiler/internalcompiler.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from copy import deepcopy
+# from copy import deepcopy
 
 from sympy import Symbol
 from sympy.logic import And, Not, Xor
@@ -27,14 +27,14 @@
 class InternalCompiler(Compiler):
     """InternalCompiler translating an expression list to quantum circuit"""
 
-    def is_symbol_referenced_in_remaining_exps(self, symbol):
-        """Return True if the symbol is referenced in remaining expressions"""
-        for sym, exp in self.remaining_exps:
-            if sym == symbol:
-                return True
-            if symbol in exp.free_symbols:
-                return True
-        return False
+    # def is_symbol_referenced_in_remaining_exps(self, symbol):
+    #     """Return True if the symbol is referenced in remaining expressions"""
+    #     for sym, exp in self.remaining_exps:
+    #         if sym == symbol:
+    #             return True
+    #         if symbol in exp.free_symbols:
+    #             return True
+    #     return False
 
     def compile(  # noqa: C901
         self, name, args: Args, returns: Arg, exprs: BoolExpList, uncompute=True