[tex-k] Is there a way to find the error line?

[Karl Berry]

    Is there a way to localize the error? 

For the record, this is the brief reply I sent to when Yannis asked me
separately. It's all I have. Web2c is a lousy development environment,
no question.

-----------------------------------------------------------------------------
Date: Fri, 19 Mar 2021 11:19:09 -0700
From: Karl Berry <karl at freefriends.org>
To: yannis1962 at gmail.com
Subject: Re: Debugging
In-Reply-To: <466F362F-4E43-4655-B0FC-2710ABD215AD at gmail.com>

    Can you tell me how to localize the error?

There is no good way. Just have to go back to the original, make sure it
works, and add individual lines until you find the error, which
apparently has something to do with "true" and a semicolon.

Sometimes the .c file(s) left in (in your case)
  /var/folders/1n/fvs3dd2d5gqghwcw8khb41_h0000gn/T/
as given by the error msg provide a clue. [...]