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I injected an exception into `.pants.d//test/pytest-prep/CPython-2.7.15/__UNCACHEABLE_HASH__/.deps/pytest-3.6.3-py2.py3-none-any.whl/_pytest/main.py`:
```
    def matchnodes(self, matching, names):
        self.trace("matchnodes", matching, names)
        self.trace.root.indent += 1
        raise ValueError("{} {}".format(matching, names))
```
and got: