[PATCH] D31697: Check for null before using TUScope

[Kim Gräsman via Phabricator via cfe-commits]

kimgr added a comment.

This was eventually fixed in IWYU. I believe the problem is/was:

- After code is parsed and the AST is built, Sema resets its `TUScope` member to null
- We use Sema to lookup and define default constructors before traversing the AST using a RAV
- Some yet-not-fully-identified constructs cause Sema to need a TUScope for this (something to do with `LazilyCreateBuiltin`, but I haven't been able to construct a reduced testcase)

So in https://github.com/include-what-you-use/include-what-you-use/commit/5e7843434169a8af333305ebd6e1434cc3cffb66, we explicitly re-point `Sema::TUScope` to `Sema::getCurScope()`, which seems to have fixed the crash.

This revision can be closed.


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  https://reviews.llvm.org/D31697/new/

https://reviews.llvm.org/D31697