mutating a variable’s type does not give an error

[block0xhash]

Hi It says here https://rust-book.cs.brown.edu/ch03-01-variables-and-mutability.html that:

if we try to use mut for a variable that is shadowed you will get an error:

however I got a warning instead and the code runs:

~/rustbook/variables$ cargo --version
cargo 1.76.0 (c84b36747 2024-01-18)
~/rustbook/variables$ rustc --version
rustc 1.76.0 (07dca489a 2024-02-04

[willcrichton]

The book's snippet is not shadowing spaces, but rather re-assigning to it. Note that there is no let keyword on the second line.

[block0xhash]

Thanks Will. I get it now