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Currently a variety of combinations of array declarations are accepted while parts are silently ignored or overruled.

The Vala code:

void main() {
    int[10] arr = {1};
    stdout.printf("Length: %d\n", arr.length);
}

doesn't give any compilation error. C code:

void
_vala_main (void)
{
	gint* arr = NULL;
	gint* _tmp0_;
	gint arr_length1;
	gint _arr_size_;
	FILE* _tmp1_;
	_tmp0_ = g_new0 (gint, 1);
	_tmp0_[0] = 1;
	arr = _tmp0_;
	arr_length1 = 1;
	_arr_size_ = arr_length1;
	_tmp1_ = stdout;
	fprintf (_tmp1_, "Length: %d\n", arr_length1);
	arr = (g_free (arr), NULL);
}

Using a size in that context shouldn't be allowed.

Trying to declare a function which takes an array as a parameter with the same type declaration:

void func(int[10] arr) {
}

however correctly results in a reasonable error message "syntax error, no expression allowed between array brackets" (for some reason the error message is duplicated).