amccarth added inline comments.

================
Comment at: include/lldb/Utility/FileSpec.h:250
+  /// unreliable (e.g. "c:\foo.txt" is a valid relative posix path).
+  static llvm::Optional<Style> GuessPathStyle(llvm::StringRef path);
+
----------------
Given that this implementation is limited to absolute paths ... should it be in 
such a general purpose class?  

If so, maybe this restriction be made more obvious by naming the parameter 
`absolute_path`.  Then people who just look at the signature without reading 
the comments, or who get a prompt in their IDE are more likely to note the 
limitation.


================
Comment at: source/Utility/FileSpec.cpp:375
+    return Style::windows;
+  return llvm::None;
+}
----------------
The code this replaces was returning `Style::native` rather than `Style::None`. 
 I'm not sure if that will have any implications.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57895/new/

https://reviews.llvm.org/D57895



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