sammccall added a comment.

This makes `SymbolCollector` (production code) depend on YAML (explicitly 
experimental), as well as on Tooling interfaces.
At least we should invert this by making the thing passed to SymbolCollector a 
`function<void(const Symbol&)>` or so.

Moreover, it's unfortunate we'd need to change SymbolCollector at all. 
Currently it's a nice abstraction that does one thing (AST -> `SymbolSlab`), 
now we're making it do two things. It can't be for scalability reasons - 
there's no problem fitting all the symbols from a TU in memory. So why do we 
need to do this?
I don't really understand the `ToolExecutor` interfaces well, but ISTM 
overriding `SymbolIndexActionFactory::runInvocation` to flush the symbols in 
the slab out to the `ExecutionContext` would allow you to use `SymbolCollector` 
unchanged?


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D41730



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