#3369 Array of incomplete element type does not give error in the frontend

[Philipp Klaus Krause]

Declaring an array of incomplete element type should give an error telling us that this is not allowed:

int ipts2[2][]={{1,2},{3,4}};

static int va2(int nargs,...);

void
g (void)
{
va2(4,ipts2[0],ipts2[1]);
}

Instead the frontend accepts this, resulting in a rather nondescriptive error message later:

test.c:8: error 66: attempt to allocate variable of unknown size 'iTemp0'

[Philipp Klaus Krause]

Same for other incomplete struct and union types.