Program logic bugs vs input/environmental errors

[bearophile via Digitalmars-d]

Walter Bright:

> As for the programmer wanting to know where the message 
> "missing }" came from,
>
>     grep -r dmd/src/*.c "missing }"
>
> works nicely. I do that sort of thing all the time. It really 
> isn't a problem.

grep is not useful for the purposes explained in issue 13543 
because the file name is often inside a string variable, that is 
initialized elsewhere or generated in some way. So the exception 
is useful to know where's the instruction in user code that has 
tried the failed I/O action, as I've explained in that issue.

Bye,
bearophile