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