static String safeStringArgument(final SourceIdentifier source, final IRStatement stmt, final String desc) {
final StatementSourceReference ref = getReference(source, stmt);
final IRArgument arg = stmt.argument();
static String safeStringArgument(final SourceIdentifier source, final IRStatement stmt, final String desc) {
final StatementSourceReference ref = getReference(source, stmt);
final IRArgument arg = stmt.argument();