./ivltests/br_gh956b.v:3: error: Variable 'y' cannot be driven by a primitive or continuous assignment with non-default strength.
./ivltests/br_gh956b.v:3: error: Failed to elaborate primitive output expression top.i1.y.
./ivltests/br_gh956b.v:4: error: Variable 'z' cannot be driven by a primitive or continuous assignment with non-default strength.
./ivltests/br_gh956b.v:4: error: Failed to elaborate primitive output expression top.i1.z.
./ivltests/br_gh956b.v:3: error: Variable 'y' cannot be driven by a primitive or continuous assignment with non-default strength.
./ivltests/br_gh956b.v:3: error: Failed to elaborate primitive output expression top.i2.y.
./ivltests/br_gh956b.v:4: error: Variable 'z' cannot be driven by a primitive or continuous assignment with non-default strength.
./ivltests/br_gh956b.v:4: error: Failed to elaborate primitive output expression top.i2.z.
8 error(s) during elaboration.