@Override
	public Set<AssemblyResolvedPatterns> getForbids() {
		return forbids;
	}
If the construct state is a {@code ^instruction} or other purely-recursive constructor, get
its single child.

@param state the parent state
@return the child state if recursive, or null
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/DefaultAssemblyResolvedPatterns.java