I'm not sure what the nature of the behavior is, but some programs, in particular simple ones based on rack.ru, working in thin mode, cannot be easily debugged. When the breakpoint worked, the source is not available
Please note that this is not the same as this other SO [Question] [1]
[1]: In ruby, why does my IRB interactive debugging session always say βNo source fileβ and β always-say-no-sourcefile
err, . Dir.chdir. , , .
Dir.chdir
, - .
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