aaron.ballman added inline comments.
================
Comment at: clang-tidy/abseil/StrCatAppendCheck.cpp:91-92
+  diag(Op->getBeginLoc(),
+       "please use absl::StrAppend instead of absl::StrCat when appending to " 
       
+       "an existing string")
+      << FixItHint::CreateReplacement(
----------------
aaron.ballman wrote:
> This wins the award for "kindest diagnostic message". :-D How about: `call 
> 'absl::StrAppend' instead of 'absl::StrCat' when appending to a string`?
> 
> That said, the diagnostic doesn't say *why* the code is wrong in the first 
> place. The documentation doesn't really go into it either. Is it a 
> correctness issue, a performance issue, something else?
So this is a performance concern, not a correctness concern? In that case, how 
about: `call 'absl::StrAppend' instead of 'absl::StrCat' to avoid a performance 
penalty when appending to a string`?


https://reviews.llvm.org/D51061



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