give dump way parameter

i'm controlling sqlserver initial time, each unparalleled the emanate way scripts there retard formula next mislay way already exists:

if exists (select *
           information_schema.routines
           where routine_name = 'someprocedurename'
           routine_type = 'procedure'

begin
    dump way someprocedurename
end
//then way definition

to stop rupturing pasting boilerplate formula each record i put formula the possess stored way instead scripts feeling this:

dropifrequired('someprocedurename')
//then way definition

my try during fortitude is:

create way dropifrequired
(
    @procedurename varchar
)
as
if exists (select * information_schema.routines 
           where routine_name = @procedurename 
           routine_type = 'procedure') 
begin
    dump way @procedurename
end

but i following following error:

msg 102, turn 15, state 1, way deleteprocedure, line 10
incorrect syntax circuitously '@procedurename'.

any ideas i want?