String interpolation

[Daniel Barlow]

Having noted the existence of Interpolation.pm, and even despite
having read http://savage.net.au/Perl/html/interpolation.html , I
remained convinced that there should be some way to embed the result
of arbitrary Perl evaluation into a double-quoted string.  And indeed
I appear to have found it: as witness -

  DB<2> x "2 plus 2 is @{[2+2]}"
0  '2 plus 2 is 4'
  DB<3> x "hello, my name is @{[ucfirst getlogin()]}.  Who are you?"
0  'hello, my name is Dan.  Who are you?'

I can't remember having seen this before: is that because (a) it's new
(unlikely, I know), (b) it's a bad idea, or (c) I just don't pay
enough attention when reading other people's code?


-dan