can't execute __temp_51[0] at /tmp/example.cr:12:22: __temp_51 has no type

[DougEverly]

crystal run /tmp/example.cr 
can't execute `__temp_51[0]` at /tmp/example.cr:12:22: `__temp_51` has no type

enum Control
  Start
  Stop
end

items = Channel(String).new(10)
control = Channel(Control).new(10)

spawn do
  begin
    loop do
      index, value = Channel(String|Control).select(items, control)
      case value
      when String
        puts value
      when Control
        puts "control item"
      else
        puts "else"
      end
    end
  rescue e : Exception
    puts e.message
  end
end

control.send(Control::Start)
items.send("Hello")
control.send(Control::Stop)

sleep 5

And without rescue block:

$ crystal run /tmp/example.cr 
Unhandled exception:
can't execute `__temp_51[0]` at /tmp/example.cr:11:20: `__temp_51` has no type (Exception)
[4547076370] *CallStack::unwind:Array(Pointer(Void)) +82
[4547076273] *CallStack#initialize<CallStack>:Array(Pointer(Void)) +17
[4547076232] *CallStack::new:CallStack +40
[4547078929] *Exception#initialize<Exception, String, Nil>:CallStack +33
[4547078860] *Exception::new<String>:Exception +92
[4547063785] *raise<String>:NoReturn +9
[4547070820] ~fun_literal_21 +52
[4547132884] *Fiber#run<Fiber>:Nil +212
[4547065065] ~fun_literal_4 +9

enum Control
  Start
  Stop
end

items = Channel(String).new(10)
control = Channel(Control).new(10)

spawn do
  loop do
    index, value = Channel(String | Control).select(items, control)
    case value
    when String
      puts value
    when Control
      puts "control item"
    else
      puts "else"
    end
  end
end

control.send(Control::Start)
items.send("Hello")
control.send(Control::Stop)

sleep 5

[asterite]

@DougEverly Definitely a bug, thanks for reporting.

But select is used like this:

index, value = Channel.select(items.receive_op, control.receive_op)

Like that it compiles and seems to work. Eventually we'll have a select expression to make that easier to write.