In editor, add a new field.

required int64 id =

press ctrl-space, and it offers id 10.

I press Enter to accept it, and add a semicolon to end the declaration. The semicolon triggers an additional "10", so instead of looking like this

required int64 id = 10;

it looks like this

required int64 id = 10; 10

Changes can be seen at r42e46dbcbd4c