================
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -verify %s
+// RUN: diff %s %s.expected
----------------
nhaehnle wrote:
Right, it's all a little mind-bending, but my point is that since you're trying
to test whether the invocation of `not %{lit} %S/LitTests --update-tests` in
`lit-plugin.test` updated the tests to look like the `.expected` file, that
invocation of `diff` should *also* be in `lit-plugin.test`.
You can't have the correctness check for a test that modifies a file be in the
same file that is being modified. It has to live outside.
https://github.com/llvm/llvm-project/pull/97369
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