@Override
	public String toString() {
		return "DWARFSourceInfo [filename=" + filename + ", lineNum=" + lineNum + "]";
	}
Returns the source location info as a string formatted as "filename:linenum"

@return "filename:linenum"
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFSourceInfo.java