seen := false
		for _, kv := range keys {
			if kv.String() == k {
				seen = true
				break
			}
		}
		if !seen {
			t.Errorf("Missing key %q", k)
		}

		// Check that value lookup is correct.
		vv := mv.MapIndex(ValueOf(k))
		if vi := vv.Int(); vi != int64(v) {
			t.Errorf("Key %q: have value %d, want %d", k, vi, v)
		}

		// Copy into new map.

<pre>
var i int
var U, V, W float64
var k = 0
var x, y float32 = -1, -2
var (
	i       int
	u, v, s = 2.0, 3.0, "bar"
)
var re, im = complexSqrt(-1)
var _, found = entries[name]  // map lookup; only interested in "found"
</pre>

<p>
If a list of expressions is given, the variables are initialized
with the expressions following the rules for <a href="#Assignments">assignments</a>.