[clang] [llvm] [Clang-Repl] Introduce Error Recovery for Clang-Repl. (PR #223305)

[via cfe-commits]

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@@ -54,6 +54,7 @@
 namespace clang {
 
 class ASTContext;
+class DeclStateReverter;
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SahilPatidar wrote:

I looked at ASTDeclUnmerger. There is some overlap, but the mechanism is different.

The current workflow needs ::detach/unlink functionality. `ASTDeclUnmerger` works by visiting declarations, while the current workflow uses `DeclStateUnlinkPolicy` as a per-PTU decision-maker and asks DeclStateReverter to do the actual work.

So for me, changing `ASTDeclUnmerger` to fit this would be more like replacing its current behavior or renaming DeclStateReverter to ASTDeclUnmerger.

https://github.com/llvm/llvm-project/pull/223305