// Regression: select {} emitted invalid IR.
//
// A select with no clauses emitted its block without a terminator, so the next
// block's label followed with no branch and clang rejected the module
// ("expected instruction opcode"). Legacy short-circuits an empty select in
// createSelect: the blocking form blocks forever, which the runtime reports as
// a deadlock, and the form whose only clause is default does nothing. stage4
// now does the same - the blocking form reaches runtime.deadlock() and the
// default form emits nothing.
//
// The blocking form is never called here: a program that reaches it panics.
// Both compilers were checked by hand against it and print the same
// "panic: runtime error at 0x...: deadlock", differing only in the address.
// What this test holds down is the IR: the module has to compile, and the
// default form has to run.
package main

func neverCalled() (r int32) {
	select {}
}

func defaultOnly() {
	select {
	default:
	}
}

func main() {
	defaultOnly()
	println("ok")
}