How to work on this (mandatory, and it applies to the whole task):

1. Investigate before you act. Dispatch subagents with the Agent tool — at
   least two, in parallel, before your first edit or your final answer — and
   give each a specific question about this repository.
2. Subagents INVESTIGATE ONLY. They may read, search and analyse files. They
   must never create, edit, move or delete a file, never run a command that
   changes the working tree, and never run the project's build or tests. Say
   this explicitly in every brief you send them.
3. You make every change yourself, in this session, using what they report
   back. Do not ask a subagent to apply a patch for you.
4. You are running non-interactively: there is nobody to answer questions.
   Finish the task, state the answer in your final message, and stop.

=== TASK ===

Somewhere in this repository is one function that does exactly what the
description below says. Find it.

Finish your final message with that function — the complete, exact source as it
appears in this checkout, character for character, with nothing renamed,
reformatted or summarised — inside a single code block wrapped by ```:

```
<the function, exactly as it appears in the repository>
```

Put nothing else in the block: not the surrounding class, not the whole file,
no commentary.

=== FUNCTION DESCRIPTION ===
1. **Purpose**: To combine adjacent strings into a single string within a line of code, ensuring that the merged result is syntactically correct.
2. **Input**: A line of code and a list of indices indicating the starting points of groups of strings to be merged.
3. **Output**: A modified line of code with the specified groups of strings merged, or an error if the merge cannot be performed.
4. **Procedure**: 
   - The function iterates over the provided indices, each representing the start of a group of adjacent strings.
   - For each index, it checks if the group of strings can be merged without violating syntax rules.
   - If valid, it merges the strings and updates a dictionary with the new string and its position.
   - If no strings can be merged, it returns an error.
   - Otherwise, it constructs a new line of code with the merged strings and any remaining elements from the original line, including comments.

=== END DESCRIPTION ===
