From: Shashank Date <sdate@...>
Date: 2003-05-31T11:54:40+09:00
Subject: IF statement in ruby 1.8.0 (2003-05-26) [i386-mswin32]

Just when I thought that I had perfectly understood the IF statement in
Ruby, I had this humbling revelation:
(line numbers for reference only)
#----------------------------------------------------------------
01: set_trace_func proc{|event, file, line, objId, binding, klass|
02:                                           p [file,line] if(event ==
'line')  }
03:
04: a = 0 #<---- Remove this 0
05:    if
06:    true
07:      puts 'here'
08:      10
09:    else
10:      puts 'there'
11:      20
12:    end
13:
14: p a
15:
16: set_trace_func(nil)
#-----------------------------------------------------------------

This produces:

    ["C:/atest/tst_set_trace.rb", 4]
    ["C:/atest/tst_set_trace.rb", 6]     <<< This is ok...
    ["C:/atest/tst_set_trace.rb", 6]     <<<  But why this ?
    ["C:/atest/tst_set_trace.rb", 7]
    here
    ["C:/atest/tst_set_trace.rb", 8]
    ["C:/atest/tst_set_trace.rb", 14]
    0
    ["C:/atest/tst_set_trace.rb", 16]

Notice the line 6 traced twice ??
And now remove the 0 (just the constant, not the 'a = ' ) on line 4
to get:

    ["C:/atest/tst_set_trace.rb", 4]
    ["C:/atest/tst_set_trace.rb", 6]
    ["C:/atest/tst_set_trace.rb", 7]
    here
    ["C:/atest/tst_set_trace.rb", 8]
    ["C:/atest/tst_set_trace.rb", 14]
    10
    ["C:/atest/tst_set_trace.rb", 16]

which is what I expected in the first place.

Me lost :-|
TIA,
--shanko