Cryptic error messages: Bug in guile?

Cryptic error messages: Bug in guile?

[swedebugia]

Hi

I try to package for guix.
Sometimes I forget a parens somewhere.

When I invoke make in the guix source tree the parens error will be 
reported as any other kind of error. (unbound variable, package not 
found, etc)

I would like to know if there is a way to avoid/improve this.

E.g. make guile count parens before evaluation or whatever so that I get 
a clear error, fast.

Alternatively maybe somebody else has a parens counter script I could 
use? E.g. I could tell make to first traverse all files looking for 
unmatching parens.
-- 
Cheers Swedebugia

Re: Cryptic error messages: Bug in guile?

[brettg]

On 13.11.2018 02:35, swedebugia wrote:
> Hi
> 
> I try to package for guix.
> Sometimes I forget a parens somewhere.
> 
> When I invoke make in the guix source tree the parens error will be
> reported as any other kind of error. (unbound variable, package not
> found, etc)
> 
> I would like to know if there is a way to avoid/improve this.
> 
> E.g. make guile count parens before evaluation or whatever so that I
> get a clear error, fast.
> 
> Alternatively maybe somebody else has a parens counter script I could
> use? E.g. I could tell make to first traverse all files looking for
> unmatching parens.

Generally you can backtrace these kinds of errors and see what the 
unbound variable is tied to some Guile module that you can declare. IIRC 
this is also available in `guix lint`.

Did that help any?

Brett Gilio

Re: Cryptic error messages: Bug in guile?

[Alex Vong]

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Hello,

swedebugia <swedebugia@riseup.net> writes:

> Hi
>
> I try to package for guix.
> Sometimes I forget a parens somewhere.
>
> When I invoke make in the guix source tree the parens error will be
> reported as any other kind of error. (unbound variable, package not
> found, etc)
>
> I would like to know if there is a way to avoid/improve this.
>
> E.g. make guile count parens before evaluation or whatever so that I
> get a clear error, fast.
>
> Alternatively maybe somebody else has a parens counter script I could
> use? E.g. I could tell make to first traverse all files looking for
> unmatching parens.

What error message do you receive? Usually I get something like:

  ERROR: In procedure read:
  In procedure scm_i_lreadparen: #<unknown port>:1:2: end of file

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Re: Cryptic error messages: Bug in guile?

[Ludovic Courtès]

Hi,

Alex Vong <alexvong1995@gmail.com> skribis:

> swedebugia <swedebugia@riseup.net> writes:
>
>> Hi
>>
>> I try to package for guix.
>> Sometimes I forget a parens somewhere.
>>
>> When I invoke make in the guix source tree the parens error will be
>> reported as any other kind of error. (unbound variable, package not
>> found, etc)

[...]

> What error message do you receive? Usually I get something like:
>
>   ERROR: In procedure read:
>   In procedure scm_i_lreadparen: #<unknown port>:1:2: end of file

This message is rather obscure (unless you’re familiar with
libguile/read.c) so Guix has a hack to translate it into a
human-readable message:

  https://git.savannah.gnu.org/cgit/guix.git/tree/guix/ui.scm#n348

Ludo’.