const runtime.traceEvGoBlockSend

2 uses

	runtime (current package)
		chan.go#L258: 	gopark(chanparkcommit, unsafe.Pointer(&c.lock), waitReasonChanSend, traceEvGoBlockSend, 2)
		trace.go#L46: 	traceEvGoBlockSend       = 22 // goroutine blocks on chan send [timestamp, stack]