srhines added a comment.

In https://reviews.llvm.org/D36728#842644, @lhames wrote:
> The preferred solution to this is actually to wrap the call with cantFail 
> (See 
> http://llvm.org/docs/ProgrammersManual.html#using-cantfail-to-simplify-safe-callsites)
>  -- it will handle both the assertion and consumption of the value for you, 
> and will simplify calls that return an Expected<T>.


Is it ok to drop the assertion in that case (and convert it to a comment)? I 
didn't want to alter too much of this check, since perhaps the original 
author(s) were more skeptical about this breaking (hence the assertion). 
Something like:

// Replacements must not conflict since ranges have been merged.
llvm::cantFail(FakeReplaces.add(...));


Repository:
  rL LLVM

https://reviews.llvm.org/D36728



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