Remove unneeded unification

trans/transpiler/phases/typing/block.py

@@ -54,7 +54,6 @@ class ScoperBlockVisitor(ScoperVisitor):
         target = node.targets[0]
         ty = self.get_type(node.value)
         node.is_declare = self.visit_assign_target(target, ty)
-        target.type.unify(ty)
 
     def visit_assign_target(self, target, decl_val: BaseType) -> bool:
         if isinstance(target, ast.Name):