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Summary:
Some tests want to create a TestMount but don't care what files are in the mount. The following code is intuitively correct. However, TestMount's constructor takes a FakeTreeBuilder by non-const reference, so it fails to compile:
auto testMount = TestMount{FakeTreeBuilder{}};
The following code works, but more verbose:
auto builder = FakeTreeBuilder{};
auto testMount = TestMount{builder};
Overload TestMount's constructor to allow the former form in addition to the latter form. This neatly shrinks some test code.
This diff should not change behavior.
Reviewed By: chadaustin
Differential Revision: D14060110
fbshipit-source-id: c6a5d4b2c5859812efff279dedbc1fe690c8f8ad
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