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---
title: "Immutable Cast"
description: "Detection of object cast from immutable types to mutable types. For instance, it will detect casts from `ImmutableList` to `List`, `ImmutableMap` to `Map`, and `ImmutableSet` to `Set`."
---
Detection of object cast from immutable types to mutable types. For instance, it will detect casts from `ImmutableList` to `List`, `ImmutableMap` to `Map`, and `ImmutableSet` to `Set`.
**\*\*\*DEPRECATED\*\*\*** Unmaintained due to poor actionability of the reports.
Activate with `--immutable-cast`.
Supported languages:
- C/C++/ObjC: No
- C#/.Net: Yes
- Erlang: No
- Java: Yes
Casts flagged by this checker are unsafe because calling mutation operations on the cast objects will fail at runtime.
## List of Issue Types
The following issue types are reported by this checker:
- [CHECKERS_IMMUTABLE_CAST](/docs/next/all-issue-types#checkers_immutable_cast)