Fixed mypy issue

Author: Theomat

synth/semantic/evaluator.py

@@ -55,7 +55,7 @@ def compress(self, program: Program) -> Program:
                 value = self.eval(program, [])
                 self.use_cache = before
                 # Cancel compression of callable
-                if isinstance(value, Callable):
+                if isinstance(value, Callable): #type: ignore
                     return Function(program.function, args)
                 tval = __tuplify__(value)
                 if tval in self._dsl_constants: