Subject: Re: bug#26163: time-difference doesn't detect error of differing time types

From: Mark H Weaver <[email-masked]>
Date: Sun, 21 Oct 2018 19:45:14 -0400

Zefram <[email-masked]> writes:

> scheme@(guile-user)> (use-modules (srfi srfi-19))
> scheme@(guile-user)> (time-difference (make-time time-tai 0 1) (make-time time-utc 0 1))
> $1 = #<time type: time-duration nanosecond: 0 second: 0>
>
> SRFI-19 is explicit that it "is an error" if the arguments to
> time-difference are of different time types, and correspondingly the
> Guile documentation says the arguments "must be" of the same type.
> It would be very easy for time-difference to detect and signal this error.
> It's not absolutely a bug that it currently doesn't, but it would be a
> useful improvement if it did.

Agreed.  Fixed in commit c9d903b6e4f8cc1d8382b20a2f0502c4ce8ffe0a on the
stable-2.2 branch.  I'm closing this bug, but feel free to reopen if
appropriate.

     Thanks!
       Mark