CodingGamerHD wrote:

Doesn't compile on Ubuntu 16.10.

src/main.rs:141:17: 141:34 error: the `?` operator is not stable (see issue #31436)
src/main.rs:141     let mut f = File::open(path)?;
                                ^~~~~~~~~~~~~~~~~
src/main.rs:143:5: 143:32 error: the `?` operator is not stable (see issue #31436)
src/main.rs:143     f.read_to_string(&mut buf)?;
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
src/main.rs:148:17: 148:36 error: the `?` operator is not stable (see issue #31436)
src/main.rs:148     let mut f = File::create(path)?;
                                ^~~~~~~~~~~~~~~~~~~
src/main.rs:149:5: 149:30 error: the `?` operator is not stable (see issue #31436)
src/main.rs:149     write!(f, "{:?}", score)?;
                    ^~~~~~~~~~~~~~~~~~~~~~~~~

BookOwl wrote:

CodingGamerHD wrote:

Doesn't compile on Ubuntu 16.10.

src/main.rs:141:17: 141:34 error: the `?` operator is not stable (see issue #31436)
src/main.rs:141     let mut f = File::open(path)?;
                                ^~~~~~~~~~~~~~~~~
src/main.rs:143:5: 143:32 error: the `?` operator is not stable (see issue #31436)
src/main.rs:143     f.read_to_string(&mut buf)?;
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
src/main.rs:148:17: 148:36 error: the `?` operator is not stable (see issue #31436)
src/main.rs:148     let mut f = File::create(path)?;
                                ^~~~~~~~~~~~~~~~~~~
src/main.rs:149:5: 149:30 error: the `?` operator is not stable (see issue #31436)
src/main.rs:149     write!(f, "{:?}", score)?;
                    ^~~~~~~~~~~~~~~~~~~~~~~~~

Your Rust is too old. You need a Rust >=1.13