public boolean isExternalSymbol(Symbol s) {
		return s.getAddress().isExternalAddress();
	}
Checks if the symbol is at the beginning of a subroutine.
@param s the symbol to check
@return boolean true if the symbol is at the beginning of a subroutine.
Ghidra/Features/Base/src/main/java/ghidra/app/util/SymbolInspector.java