diff --git a/libc/utils/CPP/ArrayRef.h b/libc/utils/CPP/ArrayRef.h
--- a/libc/utils/CPP/ArrayRef.h
+++ b/libc/utils/CPP/ArrayRef.h
@@ -37,11 +37,11 @@
   explicit ArrayRefBase(T &OneElt) : Data(&OneElt), Length(1) {}
 
   // Construct an ArrayRefBase from a pointer and length.
-  ArrayRefBase(pointer data, size_t length) : Data(data), Length(length) {}
+  ArrayRefBase(pointer Data, size_t Length) : Data(Data), Length(Length) {}
 
   // Construct an ArrayRefBase from a range.
-  ArrayRefBase(iterator begin, iterator end)
-      : Data(begin), Length(end - begin) {}
+  ArrayRefBase(iterator Begin, iterator End)
+      : Data(Begin), Length(End - Begin) {}
 
   // Construct an ArrayRefBase from a C array.
   template <size_t N>