public ConversionWarner(DiagnosticPosition pos,
    String uncheckedKey,
    Type found,
    Type expected) 
{
            super(pos);
            this.uncheckedKey = uncheckedKey;
            this.found = found;
            this.expected = expected;
}

 public  void warn(LintCategory lint) 
{
            boolean warned = this.warned;
            super.warn(lint);
            if (warned) return; // suppress redundant diagnostics
            switch (lint) {
                case UNCHECKED:
                    Check.this.warnUnchecked(pos(), "prob.found.req", diags.fragment(uncheckedKey), found, expected);
                    break;
                case VARARGS:
                    if (method != null &&
                            method.attribute(syms.trustMeType.tsym) != null &&
                            isTrustMeAllowedOnMethod(method) &&
                            !types.isReifiable(method.type.getParameterTypes().last())) {
                        Check.this.warnUnsafeVararg(pos(), "varargs.unsafe.use.varargs.param", method.params.last());
                    }
                    break;
                default:
                    throw new AssertionError("Unexpected lint: " + lint);
            }
}