Crash when regenerate changed file

[red-beeard]

I receive the error Fatal error: String index is out of bounds when using Sourcery with inline generation.

Steps to reproduce:

1. Edit the file in Xcode.
2. Save the file (CMD+S).
3. Trigger file regeneration.

Regeneration does not lead to an error on subsequent attempts.

Version: 2.2.4

sourcery --config .sourcery_without_project.yml --verbose
Using configuration file at '.sourcery_without_project.yml'
Resolving configurations took 0.0075528621673583984
Scanning sources...
	loadOrParse: 0.03952503204345703
	reduce: 0.00018978118896484375
	composer: 0.002712249755859375
	total: 0.04244422912597656
Found 9 types in 7 files, 1 changed from last run.
Files changed:
/Users/red_beeard/Desktop/SourceryParsable/SourceryAutoInit/Models/Episode.swift
Loading templates...
Loaded 3 templates.
	Loading took 0.005421161651611328
Generating code...
Rendering template /Users/red_beeard/Desktop/SourceryParsable/Templates/Sourcery/AutoInitClass.stencil
	Generating AutoInitClass.stencil took 0.009504079818725586
		Processing Ranges took 0.0006799697875976562
Skipping /Users/red_beeard/Desktop/SourceryParsable/SourceryAutoInit/Models/AutoInit/AutoInitClass.generated.swift as it is empty.
Rendering template /Users/red_beeard/Desktop/SourceryParsable/Templates/Sourcery/AutoInitStruct.stencil
	Generating AutoInitStruct.stencil took 0.0031342506408691406
		Processing Ranges took 0.0008521080017089844
Swift/StringUTF16View.swift:678: Fatal error: String index is out of bounds
zsh: illegal hardware instruction  sourcery --config .sourcery_without_project.yml --verbose

This repo reproduce problem. For example:

1. Open project
2. Build project (sourcery should be installed in terminal)
3. Open Episode.swift
4. Remove one property from struct
5. Build project or run sourcery from terminal with configuration

[art-divin]

👏 Wow: thank you very much @red-beeard for the reproducible!

I'll have a look once I have time, but I would also like to welcome anyone to investigate and fix this crash - willing to provide as much support as needed 🤝