error: expected one of `,`, `.`, `?`, `}`, or an operator, found `second`
  --> $DIR/struct-initializer-comma.rs:12:9
   |
LL |     let _ = Foo {
   |             --- while parsing this struct
LL |
LL |         first: true
   |                    -
   |                    |
   |                    expected one of `,`, `.`, `?`, `}`, or an operator
   |                    help: try adding a comma: `,`
LL |         second: 25
   |         ^^^^^^ unexpected token

error[E0063]: missing field `second` in initializer of `Foo`
  --> $DIR/struct-initializer-comma.rs:9:13
   |
LL |     let _ = Foo {
   |             ^^^ missing `second`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0063`.