if retry == 0 {
					t.vlogf("RoundTrip retrying after failure: %v", roundTripErr)
					continue
				}
				backoff := float64(uint(1) << (uint(retry) - 1))
				backoff += backoff * (0.1 * mathrand.Float64())
				d := time.Second * time.Duration(backoff)
				tm := t.newTimer(d)
				select {
				case <-tm.C():
					t.vlogf("RoundTrip retrying after failure: %v", roundTripErr)
					continue

			b.Likely = ssa.BranchLikely
			bOk := s.f.NewBlock(ssa.BlockPlain)
			bFail := s.f.NewBlock(ssa.BlockPlain)
			b.AddEdgeTo(bOk)
			b.AddEdgeTo(bFail)

			if !commaok {
				// On failure, panic by calling panicnildottype.
				s.startBlock(bFail)
				s.rtcall(ir.Syms.Panicnildottype, false, nil, target)

				// On success, return (perhaps modified) input interface.
				s.startBlock(bOk)

for operands of the key type; thus the key type must not be a function, map, or
slice.
If the key type is an interface type, these
comparison operators must be defined for the dynamic key values;
failure will cause a <a href="#Run_time_panics">run-time panic</a>.
</p>

<pre>
map[string]int
map[*T]struct{ x, y float64 }
map[string]interface{}
</pre>

<p>