bridi.pir excerpt

.sub 'new' :method
    .param int mei :named('mei') :optional 
    .param pmc args :slurpy
    .local pmc iter, bridi
    .local string selbri
    selbri = typeof self
    bridi = new selbri
    bridi.'set_selbri'(selbri)
    $P0 = new 'ResizablePMCArray'
    bridi.'set_terbri'($P0)
    iter = new 'Iterator', args
  iter_loop:
    unless iter goto iter_end
    $P1 = shift iter
    bridi.'add_terbri'($P1)
    goto iter_loop
  iter_end:
    if mei goto mei_set  # LINE 31
    mei = 0
  mei_set:
    setattribute bridi, 'mei', mei
    bridi.'go'()
    .return (bridi)
.end

error message

[11:53] [inara:/Users/treed/code/mekso]% make
/Users/treed/code/parrot/parrot  -o mekso.pbc mekso.pir
error:imcc:syntax error, unexpected PARROT_OP ('setattribute')
        in file 'src/classes/bridi.pir' line 31
        included from 'src/gen_builtins.pir' line 70
        included from 'mekso.pir' line 1
make: *** [mekso.pbc] Error 1