Compiler bug with #initialize + macro + named arguments

[Sija]

Happens only when below macro is put inside #initialize method with splatted named arguments.

class Foo
  def initialize(**attributes)
    {% for var in @type.instance_vars %}
      if arg = attributes[:{{var.name.id}}]?
        @{{var.name.id}} = arg
      end
    {% end %}
  end
end

class Bar < Foo
  def initialize(**attributes)
    @bar = true
    super
  end
end

Bar.new

Above code fails with:

Nil assertion failed
0x109ed2983: *raise<String>:NoReturn at ??
0x109ed7f00: *Nil#not_nil!:NoReturn at ??
0x10b459214: *Crystal::MainVisitor#bind_initialize_instance_vars<Crystal::Type+>:Nil at ??
0x10b4604fe: *Crystal::Call#lookup_matches_in_type<Crystal::Type+, Array(Crystal::Type+), (Array(Crystal::NamedArgumentType) | Nil), Crystal::Type+, String, Bool>:Array(Crystal::Def+) at ??
0x10b31417c: *Crystal::Call#lookup_matches_without_splat<Array(Crystal::Type+), (Array(Crystal::NamedArgumentType) | Nil)>:Array(Crystal::Def+) at ??
0x10a090c7a: *Crystal::Call#recalculate:Nil at ??
0x10a80d0e0: *Crystal::MainVisitor#visit<Crystal::Call>:Bool at ??
0x10a5ecd8a: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10a5ebcf7: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10a5ebcf7: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10b45590e: *Crystal::Call#instantiate<Crystal::Matches, Crystal::Type+, Nil, (Array(Crystal::NamedArgumentType) | Nil)>:Array(Crystal::Def+) at ??
0x10b44d44d: *Crystal::Call#lookup_matches_in_type<Crystal::Type+, Array(Crystal::Type+), (Array(Crystal::NamedArgumentType) | Nil), Nil, String, Bool>:Array(Crystal::Def+) at ??
0x10a090c7a: *Crystal::Call#recalculate:Nil at ??
0x10a80d0e0: *Crystal::MainVisitor#visit<Crystal::Call>:Bool at ??
0x10a5ecd8a: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10a5ebcf7: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10b45590e: *Crystal::Call#instantiate<Crystal::Matches, Crystal::Type+, Nil, (Array(Crystal::NamedArgumentType) | Nil)>:Array(Crystal::Def+) at ??
0x10b44d44d: *Crystal::Call#lookup_matches_in_type<Crystal::Type+, Array(Crystal::Type+), (Array(Crystal::NamedArgumentType) | Nil), Nil, String, Bool>:Array(Crystal::Def+) at ??
0x10a090c7a: *Crystal::Call#recalculate:Nil at ??
0x10a80d0e0: *Crystal::MainVisitor#visit<Crystal::Call>:Bool at ??
0x10a5ecd8a: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10a5ebcf7: *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::MainVisitor>:Nil at ??
0x10ab8cb09: *Crystal::Program#visit_main<Crystal::ASTNode+, Crystal::MainVisitor, Bool, Bool>:Crystal::ASTNode+ at ??
0x10a9cf4c5: *Crystal::Program#semantic<Crystal::ASTNode+, Bool, Bool>:Crystal::ASTNode+ at ??
0x10b51a5aa: *Crystal::Command#run_command<Bool>:Nil at ??
0x109f2c493: *Crystal::Command#run:(Bool | Crystal::Compiler::Result | IO::FileDescriptor | Nil) at ??
0x109ef9077: main at ??