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Problem: No completion for :unlet $VAR.
Solution: Add completion. (Jason Franklin)
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Problem: Cannot use :unlet for an environment variable.
Solution: Make it work. Use unsetenv() if available. (Ken Takata,
closes #2855)
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Problem: Unlet command leaks memory. (Nikolai Pavlov)
Solution: Free the memory on error. (closes #1497)
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Problem: Looking up the alloc ID for tests fails.
Solution: Fix the line computation. Use assert_fails() for unlet test.
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Problem: No test for what previously caused a crash.
Solution: Add test for unletting errmsg.
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Problem: Segfault when unletting "count".
Solution: Check for readonly and locked first. (Dominique Pelle)
Add a test.
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