String literals and String module issues

[lojikil]

Overview

Ok, I worked with @yawaramin (huge thank you to them) on the ReasonML forums to narrow this down. I was clearly misreading the String module, so that's fixed; I'll attempt to figure out what the source of Parsing issues I've seen are. Namely, I've had issues strings with escapes, esp \".

I ran into this in a different context, wherein Escaped strings cause the compiler to complain about missing braces, but I ran into a similar edge case today:

Reason # let src1 = "\"test\""foo\"";
let src1: string = "\"test\"";
Reason # String.length(src1);
- : int = 6

[yawaramin]

Discussion in https://reasonml.chat/t/string-literals-and-string-module-issues/2662