void f(void)
{
    struct { int foo:3; } x;
    struct { unsigned foo:3; } y;

    x.foo = x;
    y.foo = y;    /* line A */
}

6: operands of = have illegal types `int' and `struct defined at 3'
6: operands of << have illegal types `struct defined at 3' and `int'
7: operands of = have illegal types `unsigned int' and `struct defined at 4'
rcc: src/enode.c:192: cnsttree: Assertion `0' failed.
Aborted