Compiler crash

[Codcore]

I was trying to implement something like a Ruby send method and get compiler crashed:
http://play.crystal-lang.org/#/r/63h

module Sendable

  class WrongNumberOfArguments < Exception
    def initialize(method, given, expected)
      super("Wrong number of arguments for '#{method}' (#{given} for #{expected})")
    end
  end

  class WrongInstanceMethod < Exception
    def initialize(klass, method)
      super("Instance of '#{klass}' class has no '#{method}' method")
    end
  end

  # Allows to invoke objects methods through 'send' method.
  macro create_send
    case method
      {% methods = @type.methods %}
      {% for m in methods %}
      {% args = m.args %}
    when "{{m.name.id}}"
      raise WrongNumberOfArguments.new({{m.name.stringify}}, args.length, {{m.args.length}}) unless args.length == {{m.args.length}}
      {{m.name.id}}{% unless args.empty? %}(
      {% for arg in args %}{{arg.id}}=args[:{{arg.id}}],{% end %}){% end %}
      {% end %}
    else
      raise WrongInstanceMethod.new({{@type.name.stringify}}, "#{method}")
    end
  end

  def send(method, args={} of Symbol => String)
    create_send
  end
end

class My
  include Sendable

  def hello
    send "bye"
  end

  def bye
    bye
  end
end

my = My.new
my.send "hello"

Output

; ModuleID = 'My'

%String = type { i32, i32, i32, i8 }
%My = type { i32 }
%"Hash(Symbol, String)" = type { i32, i32, %"Hash(K, V)::Entry(Symbol, String)"**, i32, i32, i1 }
%"Hash(K, V)::Entry(Symbol, String)" = type { i32 }
%"Sendable::WrongNumberOfArguments" = type { i32, %String*, i1, %"Array(String)"* }
%"Array(String)" = type { i32, i32, i32, %String** }

@symbol_table = external global [1 x %String*]
@str = private constant { i32, i32, i32, [6 x i8] } { i32 1, i32 5, i32 5, [6 x i8] c"hello\00" }
@str1 = private constant { i32, i32, i32, [4 x i8] } { i32 1, i32 3, i32 3, [4 x i8] c"bye\00" }

define %My* @"*My::new:My"() {
alloca:
  %x = alloca %My*
  br label %entry

entry:                                            ; preds = %alloca
  %0 = call i8* @__crystal_malloc(i32 ptrtoint (i32* getelementptr (i32* null, i32 1) to i32))
  %1 = bitcast i8* %0 to %My*
  %2 = bitcast %My* %1 to i8*
  call void @llvm.memset.p0i8.i32(i8* %2, i8 0, i32 ptrtoint (i32* getelementptr (i32* null, i32 1) to i32), i32 4, i1 false)
  %3 = getelementptr inbounds %My* %1, i32 0, i32 0
  store i32 76, i32* %3
  store %My* %1, %My** %x
  %4 = load %My** %x
  %5 = call i1 @"*GC::add_finalizer<My>:Nil"(%My* %4)
  %6 = load %My** %x
  ret %My* %6
}

declare i8* @__crystal_malloc(i32)

; Function Attrs: nounwind
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) #0

declare i1 @"*GC::add_finalizer<My>:Nil"(%My*)

; Function Attrs: noreturn
define void @"*My@Sendable#send<My, String>:NoReturn"(%My* %self, %String* %method) #1 {
alloca:

entry:                                            ; No predecessors!
  %0 = call %"Hash(Symbol, String)"* @"*Hash(Symbol, String)::new<Hash(Symbol, String):Class>:Hash(Symbol, String)"(i32 329)
}

declare %"Hash(Symbol, String)"* @"*Hash(Symbol, String)::new<Hash(Symbol, String):Class>:Hash(Symbol, String)"(i32)

; Function Attrs: noreturn
define void @"*My@Sendable#send<My, String, Hash(Symbol, String)>:NoReturn"(%My* %self, %String* %method, %"Hash(Symbol, String)"* %args) #1 {
alloca:

entry:                                            ; No predecessors!
  %0 = call i1 @"*String@Object#===<String, String>:Bool"(%String* bitcast ({ i32, i32, i32, [6 x i8] }* @str to %String*), %String* %method)
  br i1 %0, label %then, label %else

then:                                             ; preds = %entry
  %1 = call i32 @"*Hash(Symbol, String)@Hash(K, V)#length<Hash(Symbol, String)>:Int32"(%"Hash(Symbol, String)"* %args)
  %2 = icmp eq i32 %1, 0
  br i1 %2, label %then1, label %else2

else:                                             ; preds = %entry
  %3 = call i1 @"*String@Object#===<String, String>:Bool"(%String* bitcast ({ i32, i32, i32, [4 x i8] }* @str1 to %String*), %String* %method)
  br i1 %3, label %then3, label %else4

then1:                                            ; preds = %then
  br label %exit

else2:                                            ; preds = %then
  %4 = call i32 @"*Hash(Symbol, String)@Hash(K, V)#length<Hash(Symbol, String)>:Int32"(%"Hash(Symbol, String)"* %args)
  %5 = call %"Sendable::WrongNumberOfArguments"* @"*Sendable::WrongNumberOfArguments::new<String, Int32, Int32>:Sendable::WrongNumberOfArguments"(%String* bitcast ({ i32, i32, i32, [6 x i8] }* @str to %String*), i32 %4, i32 0)
  call void @"*raise<Sendable::WrongNumberOfArguments>:NoReturn"(%"Sendable::WrongNumberOfArguments"* %5)
  unreachable

exit:                                             ; preds = %then1
  call void @"*My#hello<My>:NoReturn"(%My* %self)
  unreachable

then3:                                            ; preds = %else
  %6 = call i32 @"*Hash(Symbol, String)@Hash(K, V)#length<Hash(Symbol, String)>:Int32"(%"Hash(Symbol, String)"* %args)
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %then5, label %else6

else4:                                            ; preds = %else

then5:                                            ; preds = %then3
  br label %exit7

else6:                                            ; preds = %then3
  %8 = call i32 @"*Hash(Symbol, String)@Hash(K, V)#length<Hash(Symbol, String)>:Int32"(%"Hash(Symbol, String)"* %args)
  %9 = call %"Sendable::WrongNumberOfArguments"* @"*Sendable::WrongNumberOfArguments::new<String, Int32, Int32>:Sendable::WrongNumberOfArguments"(%String* bitcast ({ i32, i32, i32, [4 x i8] }* @str1 to %String*), i32 %8, i32 0)
  call void @"*raise<Sendable::WrongNumberOfArguments>:NoReturn"(%"Sendable::WrongNumberOfArguments"* %9)
  unreachable

exit7:                                            ; preds = %then5
}

declare i1 @"*String@Object#===<String, String>:Bool"(%String*, %String*)

declare i32 @"*Hash(Symbol, String)@Hash(K, V)#length<Hash(Symbol, String)>:Int32"(%"Hash(Symbol, String)"*)

declare %"Sendable::WrongNumberOfArguments"* @"*Sendable::WrongNumberOfArguments::new<String, Int32, Int32>:Sendable::WrongNumberOfArguments"(%String*, i32, i32)

declare void @"*raise<Sendable::WrongNumberOfArguments>:NoReturn"(%"Sendable::WrongNumberOfArguments"*)

; Function Attrs: noreturn
define void @"*My#hello<My>:NoReturn"(%My* %self) #1 {
entry:
  call void @"*My@Sendable#send<My, String>:NoReturn"(%My* %self, %String* bitcast ({ i32, i32, i32, [4 x i8] }* @str1 to %String*))
  unreachable
}

attributes #0 = { nounwind }
attributes #1 = { noreturn }

    case method



    when "hello"
      raise WrongNumberOfArguments.new("hello", args.length, 0) unless args.length == 0
      hello


    when "bye"
      raise WrongNumberOfArguments.new("bye", args.length, 0) unless args.length == 0
      bye

    else
      raise WrongInstanceMethod.new("My", "#{method}")
    end

Nil assertion failed
_init +171007 [0]
_init +173755 [0]
_init +3251488 [0]
_init +3247103 [0]
_init +3244025 [0]
_init +3282759 [0]
_init +3188090 [0]
_init +3188388 [0]
_init +3266960 [0]
_init +3193184 [0]
_init +3266960 [0]
_init +3193215 [0]
_init +3248139 [0]
_init +3244025 [0]
_init +3282759 [0]
_init +3188090 [0]
_init +3248139 [0]
_init +3244025 [0]
_init +3282759 [0]
_init +3188090 [0]
_init +3065700 [0]
_init +3052068 [0]
_init +2396865 [0]
_init +5900354 [0]
_init +5879350 [0]
__libc_start_main +247 [0]
_init +167975 [0]

Error: you've found a bug in the Crystal compiler. Please open an issue: https://github.com/manastech/crystal/issues

[Codcore]

This happens when bye calls itself ( it's my typo, I mean p "bye" ):

def bye
    bye
  end

[asterite]

The above is actually a stack overflow, so duplicate of #271