are prototypes exportable?

prot_export.t

#!/usr/bin/env perl 
use strict;
use warnings;

use Test::Most qw{no_plan};

BEGIN {
  package My::Test;
  use Exporter qw{import};
  our @EXPORT = qw{thing};
  sub thing ($) { shift };
};

My::Test->import();
can_ok q{main}, qw{ thing };
is thing 'that', 'that';

__END__
String found where operator expected at t.t line 16, near "thing 'that'"
  (Do you need to predeclare thing?)
Not enough arguments for Test::More::is at t.t line 16, near "thing 'that'"
syntax error at t.t line 16, near "thing 'that'"
Execution of t.t aborted due to compilation errors.
# Looks like your test exited with 255 before it could output anything.