src/doc/book/listings/ch03-common-programming-concepts/no-listing-19-statements-vs-expressions/output.txt

   1 $ cargo run
   2    Compiling functions v0.1.0 (file:///projects/functions)
   3 error: expected expression, found `let` statement
   4  --> src/main.rs:2:14
   5   |
   6 2 |     let x = (let y = 6);
   7   |              ^^^
   8
   9 error: expected expression, found statement (`let`)
  10  --> src/main.rs:2:14
  11   |
  12 2 |     let x = (let y = 6);
  13   |              ^^^^^^^^^
  14   |
  15   = note: variable declaration using `let` is a statement
  16
  17 error[E0658]: `let` expressions in this position are unstable
  18  --> src/main.rs:2:14
  19   |
  20 2 |     let x = (let y = 6);
  21   |              ^^^^^^^^^
  22   |
  23   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
  24
  25 warning: unnecessary parentheses around assigned value
  26  --> src/main.rs:2:13
  27   |
  28 2 |     let x = (let y = 6);
  29   |             ^         ^
  30   |
  31   = note: `#[warn(unused_parens)]` on by default
  32 help: remove these parentheses
  33   |
  34 2 -     let x = (let y = 6);
  35 2 +     let x = let y = 6;
  36   |
  37
  38 For more information about this error, try `rustc --explain E0658`.
  39 warning: `functions` (bin "functions") generated 1 warning
  40 error: could not compile `functions` due to 3 previous errors; 1 warning emitted