dexonsmith added a comment.

In D96816#2572552 <https://reviews.llvm.org/D96816#2572552>, @ahatanak wrote:

> I still don't understand why the test was failing, but did we have to bump 
> the version because a new LangOpt (`EncodeCXXClassTemplateSpec`) was added?

Here are the RUN lines:

  // RUN: mkdir -p %t/mod
  // RUN: touch %t/empty.h
  // RUN: cp %S/Inputs/preamble-reparse-changed-module/module.modulemap %t/mod
  // RUN: cp %S/Inputs/preamble-reparse-changed-module/head.h %t/mod
  
  // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_EXECUTE_COMMAND="cp 
%S/Inputs/preamble-reparse-changed-module/new-head.h %t/mod/head.h" 
CINDEXTEST_EXECUTE_AFTER_TRIAL=1 \
  // RUN:     c-index-test -test-load-source-reparse 3 local %s -I %t -I %t/mod 
-fmodules -fmodules-cache-path=%t/mcp 2>&1 | FileCheck %s

It wouldn't have failed in a clean build.

The test is reusing the module cache path `%t/mcp` from the previous run. I 
think most implicit modules tests make themselves robust to incremental builds 
by adding something like this before the first use of the cache:

  // RUN: rm -rf %t/mcp


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D96816/new/

https://reviews.llvm.org/D96816

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