== foo ==
fun foo(x: Int) {
    val (a, b) = x
    a
}
---------------------
                       <v0>: Int                                       NEW: magic(x: Int) -> <v0>
                       <v2>: {<: [ERROR : component1() return type]}   NEW: magic(a|<v1>) -> <v2>
                       <v3>: {<: [ERROR : component2() return type]}   NEW: magic(b|<v1>) -> <v3>
x                      <v1>: *                                         NEW: r(x) -> <v1>
a                      <v4>: *                                         NEW: r(a) -> <v4>
{ val (a, b) = x a }   <v4>: *                                         COPY
=====================