# \#compiler

**URL:** https://forums.fsharp.org/tag/compiler/8.md

[Latest](https://forums.fsharp.org/latest.md) · [Categories](https://forums.fsharp.org/categories.md) · [Tags](https://forums.fsharp.org/tags.md)

---

## [F# Mono Debugger Extension](https://forums.fsharp.org/t/f-mono-debugger-extension/3372)

<div class="topic-metadata">

**Author:** [@yosua-kristianto](https://forums.fsharp.org/u/yosua-kristianto)\
**Replies:** 4\
**Last updated:** [November 24, 2023, 8:19am UTC](https://forums.fsharp.org/t/f-mono-debugger-extension/3372 "2023-11-24T08:19:57Z")

</div>

Hi. Currently learning F# by doing HackerRank problem and found out that F# with Mono-based Integrated Development Environment (IDE) was Mono Develop. Unfortunately, I’m currently using MacOS which if I attempt to downlo…

---

## [What are these escape sequences in the F# compiler source?](https://forums.fsharp.org/t/what-are-these-escape-sequences-in-the-f-compiler-source/1761)

<div class="topic-metadata">

**Author:** [@leonel\_gayard](https://forums.fsharp.org/u/leonel_gayard)\
**Replies:** 2\
**Last updated:** [December 13, 2021, 7:07pm UTC](https://forums.fsharp.org/t/what-are-these-escape-sequences-in-the-f-compiler-source/1761 "2021-12-13T19:07:20Z")

</div>

What are the following escape sequences in the F# compiler source? These are from file lex.fsl. Are these escapes sequences valid F# code or are they for the lexer generator? let letter = '\\Lu' | '\\Ll' | '\\Lt' | '\\Lm' …