1! { dg-do compile }
2! PR 23765 : We used to incorrectly accept common blocks with no symbols
3common          ! { dg-error "Syntax error" }
4common //       ! { dg-error "Syntax error" }
5common /a/      ! { dg-error "Syntax error" }
6common /b/x/c/  ! { dg-error "Syntax error" }
7common y/d/     ! { dg-error "Syntax error" }
8common /e//f/   ! { dg-error "Syntax error" }
9common ///g/    ! { dg-error "Syntax error" }
10end
11