[erlang-questions] Line numbers in escript errors?

Danil Zagoskin z@REDACTED
Tue Jul 16 13:01:57 CEST 2019


Do you use compile mode?
It gives much more meaningful stacktraces (especially when you specify
module name as well):

$ cat hello.escript
#!/usr/bin/env escript

main(_) ->
  [1/X || X <- lists:seq(-5, 2)].

$ ./hello.escript
escript: exception error: an error occurred when evaluating an arithmetic
  in function  hello:'-main/1-lc$^0/1-0-'/1 (./hello.escript, line 6)
  in call from hello:'-main/1-lc$^0/1-0-'/1 (./hello.escript, line 6)
  in call from escript:run/2 (escript.erl, line 758)
  in call from escript:start/1 (escript.erl, line 277)
  in call from init:start_em/1
  in call from init:do_boot/3

On Tue, Jul 16, 2019 at 1:38 PM Roger Lipscombe <roger@REDACTED>

> When something goes wrong in my escript, I get something like this:
> escript: exception error: no match of right hand side value
>                  {ok, ...}
>   in function  erl_eval:expr/5 (erl_eval.erl, line 453)
>   in call from erl_eval:exprs/5 (erl_eval.erl, line 126)
>   in call from lists:foldl/3 (lists.erl, line 1263)
> ...but it doesn't tell me which line in my script was at fault. Is
> there a way to get escript to divulge that information?
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Danil Zagoskin | z@REDACTED
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