bug in IRB with $_ matching a range of regexps

> % ruby -v
> ruby 1.8.2 (2005-01-29) [powerpc-darwin7.7.0]

these work fine in both forms:

> % printf "a\nb\nc\nd\n" | ruby -e 'while gets; print if /^b/../^c/; 
> end'
> b
> c
> % printf "a\nb\nc\nd\n" | ruby -e 'while gets; print if $_ =~ /^b/ .. 
> $_ =~ /^c/; end'
> b
> c

second form ($_ =~) works fine in IRB:

> % irb
> irb(main):001:0> while gets; print if $_ =~ /^b/ .. $_ =~ /^c/; end
> a
> b
> b
> c
> c
> d
> => nil

But the first form does not:

> % irb
> irb(main):001:0> while gets; print if /^b/../^c/; end
> a
> a
> b
> b
> c
> c
> d
> d
> => nil

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