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+## In `[[..]]` you shouldn't escape `(` or `)`.
+
+### Problematic code:
+
+```sh
+[[ -e ~/.bashrc -a \( -x /bin/dash -o -x /bin/ash \) ]]
+```
+
+### Correct code:
+
+```sh
+[[ -e ~/.bashrc -a ( -x /bin/dash -o -x /bin/ash ) ]]
+```
+
+### Rationale:
+
+You don't have to -- and can't -- escape `(` or `)` inside a `[[ .. ]]` expression like you do in `[ .. ]`. Just remove the escaping.
+
+### Exceptions:
+
+None.
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