gcc/testsuite/gdc.test/fail_compilation/diag9679.d

/*
TEST_OUTPUT:
---
fail_compilation/diag9679.d(11): Error: variable diag9679.main.n only parameters or foreach declarations can be ref
fail_compilation/diag9679.d(12): Error: variable diag9679.main.n storage class 'auto' has no effect if type is not inferred, did you mean 'scope'?
---
*/

void main()
{
    if (ref n = 1) {}
    if (auto int n = 1) {}
}