此脚本正常工作(注意地图功能中的连接)：

#!/usr/bin/perl
 
use strict;
use warnings;
use Data::Dumper;
 
my %aa = map { 'a' . '' => 1 } (1..3);
 
print Dumper \%aa;
 
__END__
output:
 
$VAR1 = {
          'a' => 1
        };

但是没有连接,地图就不起作用了.这是我期望工作的脚本,但它没有：

#!/usr/bin/perl
 
use strict;
use warnings;
use Data::Dumper;
 
my %aa = map { 'a' => 1 } (1..3);
 
print Dumper \%aa;
__END__
output:
 
Not enough arguments for map at e.pl line 7,near "} ("
Syntax error at e.pl line 7,near "} ("
Global symbol "%aa" requires explicit package name at e.pl line 9.
Execution of e.pl aborted due to compilation errors.

你能解释一下这种行为吗？