Re: Re-write a file in Ada

[gautier_niouzes@hotmail.com]

Le lundi 11 janvier 2016 18:18:48 UTC+1, Brian Drummond a écrit :

> > raised ADA.IO_EXCEPTIONS.END_ERROR : a-tigeli.adb:96
> 
> In outline, when you see this sort of error, find the installation's "Ada 
> include directory" which contains the named file...
> 
> locate a-tigeli.adb
> /usr/lib/gcc/x86_64-linux-gnu/4.9/rts-native/adainclude/a-tigeli.adb
> 
> open in editor (read only) ... and see
> --     A D A . T E X T _ I O . G E T _ L I N E      --
> so we know the error occurred in "Get_Line"
> 
> And look at line 96:
> 
>    function Get_Chunk (N : Positive) return Natural is
> ...blah...
>          else
>             raise End_Error;
>          end if;
> 
> Looks like we ran out of file somehow. From here on it's usually 
> straightforward.

Sure - but all that investigation effort brings nothing: the exception's name gives already this hint: the end of a file was reached. The fact that it raised somewhere in the run-time library is obvious and brings zero information for finding the bug: no indication is given about where the exception occurred in the program. It's a shame that GNAT doesn't switch on its trace-back by default, IMHO. The current setup is disturbing for beginners and cumbersome for people using GNAT for larger programs.
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