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E4002

Error · Borrow/Ownership

E4002 — Cannot access mutably borrowed variable

No example yet

No fixture in the test suite asserts this code, so there is no program here that is known to trigger it. That is a gap in our coverage rather than a statement about the code.

Contributing one is a good first change — add a fixture under tests/ with a CHECK line naming E4002, and this page picks it up.

Related

Ownership and borrowingThe chapter covering the rule this code enforces. All diagnosticsEvery code the compiler can emit, grouped by stage. E4001Use of moved or consumed linear variable E4003Cannot borrow as mutable (already immutably borrowed)