error: closure bodies that contain statements must be surrounded by braces
  --> $DIR/missing_braces_around_block.rs:14:26
   |
LL |     (1..num).reduce(|a, b|
   |                          ^
...
LL |     ).unwrap();
   |     ^
   |
note: statement found outside of a block
  --> $DIR/missing_braces_around_block.rs:16:26
   |
LL |         println!("{}", a);
   |         -----------------^ this `;` turns the preceding closure into a statement
   |         |
   |         this expression is a statement because of the trailing semicolon
note: the closure body may be incorrectly delimited
  --> $DIR/missing_braces_around_block.rs:14:21
   |
LL |       (1..num).reduce(|a, b|
   |  _____________________^
LL | |
LL | |         println!("{}", a);
   | |_________________________^ this is the parsed closure...
LL |           a * b
LL |       ).unwrap();
   |       - ...but likely you meant the closure to end here
help: try adding braces
   |
LL ~     (1..num).reduce(|a, b| {
LL |
LL |         println!("{}", a);
LL |         a * b
LL ~     }).unwrap();
   |

error: aborting due to previous error