7152 - 'return' instruction

https://github.com/akkartik/mu/issues/45#issuecomment-719990879, task 1.

We don't have checking for it yet. Soon.

1 files changed, 4 insertions, 0 deletions

diff --git a/mu.md b/mu.md
index 81c057df..bb8b68c9 100644
--- a/mu.md
+++ b/mu.md
@@ -85,6 +85,10 @@ fn g {
 }
 ```
 
+You can exit a function at any time with the `return` instruction. Give it the
+right number of arguments, and it'll assign them respectively to the function's
+outputs before jumping back to the caller.
+
 The function `main` is special; it is where the program starts running. It
 must always return a single int in register `ebx` (as the exit status of the
 process). It can also optionally accept an array of strings as input (from the