================
@@ -1095,6 +1095,8 @@ prepareAndFilterRanges(const 
SmallVectorImpl<CharSourceRange> &Ranges,
 
     unsigned StartColumn = SM.getExpansionColumnNumber(Begin);
     unsigned EndColumn = SM.getExpansionColumnNumber(End);
+    assert(StartColumn && "StartColumn has a value of 0");
----------------
shafik wrote:

Because we have the 

```cpp
 if (R.isInvalid())
      continue;
```

at the top of the loop, which is the case where they could be zero.

https://github.com/llvm/llvm-project/pull/153527
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