nridge marked an inline comment as done.
nridge added inline comments.

================
Comment at: clang-tools-extra/clangd/XRefs.cpp:258
+
+    // For now, only consider exact name matches, including case.
+    // This is to avoid too many false positives.
----------------
sammccall wrote:
> nridge wrote:
> > sammccall wrote:
> > > I wouldn't bother qualifying this as "for now". Any code is subject to 
> > > change in the future, but requiring an exact name match for index-based 
> > > results seems more like a design decision than a fixme.
> > Do we want to rule out the possibility of handling typos in an identifier 
> > name in a comment (in cases where we have high confidence in the match, 
> > e.g. a long / unique name, small edit distance, only one potential match) 
> > in the future?
> > 
> > This is also relevant to whether we want to keep the `FuzzyMatcher` or not.
> No idea whether typo-correction is a good idea in principle - tradeoff 
> between current false negatives and false positives+compute.
> 
> However neither FuzzyMatcher nor the existing index implementations 
> support/can easily support real typo correction, and it seems implausible to 
> me we'd add it for this feature.
> 
> Compare to e.g:
>  - allowing case-insensitive match in some cases: `fooBar` vs `FooBar` is a 
> plausible "typo". This is easy to implement.
>  - correct the typo where we see the fixed version used as an identifier in 
> this file (and not the original). Excludes some cases, but drives 
> false-positives way down, and easy to implement.
> 
> I don't think we need to rule things out, but I'm uncertain enough about the 
> approach to think that putting comments, fuzzymatcher etc here speculatively 
> isn't worth it.
Perhaps I'm unclear on the distinction between fuzzy matching and typo 
correction. Are they not both a matter of comparing a candidate string against 
a test string, and considering it a match if the they are "close enough" 
according to some metric (with the metric potentially being a simple edit 
distance in the case of typo correction)?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D72874/new/

https://reviews.llvm.org/D72874



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