From: nobu.nokada@...
Date: 2002-12-06T14:42:27+09:00
Subject: Re: Regexp imxo - does 'x' work?

Hi,

At Fri, 6 Dec 2002 13:58:14 +0900,
Shashank Date wrote:
> Why does the preceding literal get eliminated by  ;"" ?

"#{"Hello";""}" is equivalent to ("Hello";"").to_s or
  begin
    "Hello"
    ""
  end.to_s

Their value is one of the last expression, so value of the
preceding literal is always ignored and has no effect (except
for GC).

> Is this some thing new in 1.7?

It's warned even in 1.6, but elimination is new in 1.7.

$ ruby-1.6 -v -e 'p "#{"Hello";""}"'
ruby 1.6.8 (2002-12-02) [i686-linux]
-e:1: warning: useless use of a literal in void context
""

-- 
Nobu Nakada