debug trace session

The below is a sample trepan session showing event tracing

```trepan gcd.rb 3 5
-- (gcd.rb:4)
def gcd(a, b)
(trepan): set events call return line
Trace events we may stop on:
call, line, return
(trepan): set trace
trace is on.
(trepan): finish
-- (gcd.rb:18)
a, b = ARGV[0..1].map {|arg| arg.to_i}
-- (gcd.rb:18)
a, b = ARGV[0..1].map {|arg| arg.to_i}
-- (gcd.rb:18)
a, b = ARGV[0..1].map {|arg| arg.to_i}
-- (gcd.rb:19)
puts "The GCD of %d and %d is %d" % [a, b, gcd(a, b)]
-> (gcd.rb:4)
def gcd(a, b)
-- (gcd.rb:6)
if a > b
-- (gcd.rb:10)
return nil if a <= 0
-- (gcd.rb:12)
if a == 1 or b-a == 0
-- (gcd.rb:15)
return gcd(b-a, a)
-> (gcd.rb:4)
def gcd(a, b)
-- (gcd.rb:6)
if a > b
-- (gcd.rb:10)
return nil if a <= 0
-- (gcd.rb:12)
if a == 1 or b-a == 0
-- (gcd.rb:15)
return gcd(b-a, a)
-> (gcd.rb:4)
def gcd(a, b)
-- (gcd.rb:6)
if a > b
-- (gcd.rb:10)
return nil if a <= 0
-- (gcd.rb:12)
if a == 1 or b-a == 0
-- (gcd.rb:13)
return a
<- (gcd.rb:13)
return a
<- (gcd.rb:16)
end
<- (gcd.rb:16)
end
The GCD of 3 and 5 is 1
\$
```
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