[ruby-talk:00578] trace_var doesn't work with $< ???

Hi,

I am very diligent today, ain岐 I?  ;-)

I try do do the following...

	p :$<
	p "$<".intern

	trace_var :$<, proc { p "New file" }

	while gets
	   p "#{$.}(#{$<}): #{$_}"
	end

and the call it with `ruby script.rb script.rb script.rb'. I expect to
see anything like that:

"New file"         # ****
6859
6859
"1(tt.rb): \n"
"2(tt.rb): p :$<\n"
"3(tt.rb): p \"$<\".intern\n"
"4(tt.rb): \n"
"5(tt.rb): trace_var :$<, proc { p \"New file\" }\n"
"6(tt.rb): \n"
"7(tt.rb): while gets\n"
"8(tt.rb):    p \"#{$.}(#{$<}): #{$_}\"\n"
"9(tt.rb): end\n"
"New file"         # ****
"10(tt.rb): \n"
"11(tt.rb): p :$<\n"
"12(tt.rb): p \"$<\".intern\n"
"13(tt.rb): \n"
"14(tt.rb): trace_var :$<, proc { p \"New file\" }\n"
"15(tt.rb): \n"
"16(tt.rb): while gets\n"
"17(tt.rb):    p \"#{$.}(#{$<}): #{$_}\"\n"
"18(tt.rb): end\n"

But I didn't get the lines with the `****' remark! What do I wrong?

thanks,
\cle