X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/b60c82e9d3b03aa36484c1ff68f34f4e78862d46..f9c259224010e06892dd3cc91b654965da04e0d2:/src/part05.rs

diff --git a/src/part05.rs b/src/part05.rs
index b593360..6d2d813 100644
--- a/src/part05.rs
+++ b/src/part05.rs
@@ -48,8 +48,10 @@ impl BigInt {
     }
 
     // We can convert any vector of digits into a number, by removing trailing zeros. The `mut`
-    // declaration for `v` here is just like the one in `let mut ...`, it says that we will locally
-    // change the vector `v`.
+    // declaration for `v` here is just like the one in `let mut ...`: We completely own `v`, but Rust
+    // still asks us to make our intention of modifying it explicit. This `mut` is *not* part of the
+    // type of `from_vec` - the caller has to give up ownership of `v` anyway, so they don't care anymore
+    // what you do to it.
     // 
     // **Exercise 05.1**: Implement this function.
     //