Hello BrowserUK i'm receiving too an assignement error using the wrong syntax with the not stringified left value:
#(something like:)
perl -MConfig -e "BEGIN{print 'Perl ', map {$Config{$_},' '}qw/version
+ os archname/ }; use constant X = 1/3;print qq(\n),+X,qq(\n)"

  ----------------------------------------·······
 | Can't modify constant item in scalar assignment at -e line 1, near 
+"3;"
 |  BEGIN not safe after errors--compilation aborted at -e line 1.
 |  Perl 5.14.2  MSWin32-x86-multi-thread
  --------------------------------------------------------------------
+---·······

  ----------------------------------------·······
 | Can't modify constant item in scalar assignment at -e line 1, near 
+"3;"
 |  BEGIN not safe after errors--compilation aborted at -e line 1.
 |  Perl 5.20.0  MSWin32-x86-multi-thread-64int
  --------------------------------------------------------------------
+---·······

  ----------------------------------------·······
 | Can't modify constant item in scalar assignment at -e line 1, near 
+"3;"
 |  BEGIN not safe after errors--compilation aborted at -e line 1.
 |  Perl 5.16.2  MSWin32-x64-multi-thread
  --------------------------------------------------------------------
+---·······

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In reply to Re^2: use constant usage clarification by Discipulus
in thread use constant usage clarification by perlron

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