4 fail_compilation/fnconstraint.d(14): Error: template constraint must follow parameter lists and attributes
5 fail_compilation/fnconstraint.d(14): Error: declaration expected, not `if`
6 fail_compilation/fnconstraint.d(23): Error: template constraint must follow parameter lists and attributes
7 fail_compilation/fnconstraint.d(23): Error: declaration expected, not `if`
8 fail_compilation/fnconstraint.d(27): Error: `}` expected following members in `struct` declaration
9 fail_compilation/fnconstraint.d(19): struct `S` starts here