[cfe-dev] Checker callbacks not invoked for DeclRefExpr, MemberExpr, CXXThisExpr

[Aemon Cannon]

I'm trying to write a checker for C++ code.

Registering for PreStmt<DeclRefExpr> gives no result, whereas registering
for PreStmt<Expr> at least gives me a callback on
ImplicitCast(DeclRefExpr). Likewise for MemberExpr.

I haven't found a way to consistently get a callback for CXXThisExpr.

On the other hand, CXXNewExpr, CXXDeleteStmt, etc, callback all function as
expected.

Is this a known issue or am I (likely) doing things wrong?

Thanks,
Aemon

p.s. My clang tree is synced at git 7b47adcbea945e31db3e96567e8
      A few months old now.
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