more

Author: Kyle Strand

src/panic-runtime.md

@@ -2,6 +2,15 @@
 
 XXX fill me in... 
 
+From the Book:
+
+> By default, when a panic occurs, the program starts unwinding, which means
+> Rust walks back up the stack and cleans up the data from each function it
+> encounters. However, this walking back and cleanup is a lot of work. Rust,
+> therefore, allows you to choose the alternative of immediately aborting,
+> which ends the program without cleaning up. Memory that the program was using
+> will then need to be cleaned up by the operating system.
+
 `rustc` option: `-C panic=<foo>`
 
 `panic=abort`