6g thinks a struct with one entry yields a composite that is a basic conversion
6g thinks a struct with one entry yields a composite that is a basic conversion

R=rsc
DELTA=12  (12 added, 0 deleted, 0 changed)
OCL=16989
CL=16998

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go