Segfault on Vector access after resize

[bendmorris]

• Kit version: dev
• OS/Platform: all

struct MyStruct {
    public var a: Int;
    public var b: Int;
}

function main() {
    var n: Int = 0x1000;
    var a: Array[MyStruct] = Array.new(n * 2);
    var v: Vector[Ptr[MyStruct]] = Vector.new(n);

    for i in 0 ... n * 2 {
        var x: Ptr[MyStruct] = a[i];
        v.push(x);
    }

    printf("%zx\n", v.length);
}