message: Prevent compiler-warning of possible out-of-bounds access.
diff: @@ -618,7 +618,10 @@ TEST_F(FindSubtreeStartingAtOffsetTest, LeafOnlyOffsetGreaterThan) {
  EXPECT_EQ(subtree, nullptr);
  }
  -constexpr absl::string_view kBaseText("abcdefghijklmnopqrst");
  +// Allow to look beyond kBaseText by cutting it out of a larger string.
  +constexpr absl::string_view kBaseTextPadded("_abcdefghijklmnopqrst_");
  +constexpr absl::string_view kBaseText = {kBaseTextPadded.data() + 1,
  + kBaseTextPadded.length() - 2};
  // Return a tree with monotonically increasing token locations.
  // This is suitable for tests that require only location offsets,
  @@ -644,6 +647,7 @@ struct FindSubtreeStartingAtOffsetFakeTreeTest : public testing::Test {
  // Test that a whole tree is returned when offset is less than leftmost token.
  TEST_F(FindSubtreeStartingAtOffsetFakeTreeTest, TreeOffsetLessThanFirstToken) {
  + // Note: begin() - 1 points to a valid location due to kBaseTextPadded
  SymbolPtr* subtree =
  FindSubtreeStartingAtOffset(&tree, kBaseText.begin() - 1);
  EXPECT_EQ(*subtree, tree);
  