@Override
	public void setSource(SourceType source) {
		throw new UnsupportedOperationException(
			"Setting the source of the Global symbol is not allowed.");
	}
This method doesn't apply to the global symbol, since a program always has a global symbol 
and it can't be renamed. Therefore calling it will throw an UnsupportedOperationException.
@param source the source of this symbol: Symbol.DEFAULT, Symbol.IMPORTED, Symbol.ANALYSIS, or Symbol.USER_DEFINED.
@throws UnsupportedOperationException whenever called.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/address/GlobalSymbol.java