[issue26664] find a bug in activate.fish of venv of cpython3.6

[Xiang Zhang]

Xiang Zhang added the comment:

The patch introduced by issue26348 should be reverted. The __VENV_PROMPT__ is meant to be a placeholder. For example, when you create a virtual environment named venv-test, the __VENV_PROPMT__ will be replace by (venv-test). If the patch is applied, it will be $(venv-test), treated as an expression and then cause a failure.

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nosy: +xiang.zhang

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<http://bugs.python.org/issue26664>
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