perl - Ambiguous use of -CONSTANT resolved as -&CONSTANT() -

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As I told Perlsub, I am trying to declare magic numbers as constants in my Perl scripts. However, I receive warnings: 

  $ cat foo.perl uses warnings; Strict use; Sub Constant () {5} Print 7-Constant, "\ n"; $ Perl foo.perl - The suspected use of Constant Foo.perl on line 3.   
 The warning disappears if I insert a space between zero - & amp; CONSTANT () and  constant . This expression wishes more than wind, but it works.  
 I'm curious, though: what warning does this warn me about?  
 (Pearl 5.10.1 from Debian "Squeeze").   
 
 
 First of all, let's look at some backgrounds for each other:  
  $ _ = -foo;   
  -foo  is a string literally  [1] .  
  $ perl -Mstrict - WE'say -foo; '-foo   
 Except that a sub-name has been declared  foo .  
  $ perl -Mstrict -wE'sub foo {123} say-foo; Suspicious use of '-foo - - 1-123   
 Back to your question now - & amp; Resolved as foo (). Warning is incorrect one word ( 7 ) can not be performed by another TERM, hence  -  can not start a string, or a UNION MINUS operator. << Em> << em>            
 This warning is still 5.20.0  [2] / sup>. I have filed one.  
 
     
  1.  
     Look at me! No quotes!  
      System (grep = & gt; (-R, $ pat, $ qfn));  
  2.  
     Well, 5.20.0 is not out yet, but we are in a freeze code due to its release. It will not be decided in 5.20.0.

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