When pushing changes to a package, it looks the code that reports errors is broken:

remote: error: The following errors occurred when parsing .SRCINFO in commit
remote: error: df032acd9810bd3573a9d3263f4d8de3d004ce36:
remote: Traceback (most recent call last):
remote: File "hooks/update", line 245, in <module>
remote: sys.stderr.write("error: line {:d}: {:s}\n".format(error))
remote: TypeError: non-empty format string passed to object.__format__
remote: error: hook declined to update refs/heads/master
Toaur@aur4.archlinux.org/iview.git"> ssh://aur@aur4.archlinux.org/iview.git
! [remote rejected] aur -> master (hook declined)

Looking at <https://projects.archlinux.org/aurweb.git/commit?id=ae2907a>, I suspect the code wasn’t changed properly:

-sys.stderr.write("error: line %d: %s\n" % error)
+sys.stderr.write("error: line {:d}: {:s}\n".format(error))

Depending on what “error” is, maybe it should be something like one of these:

"error: line {:d}: {:s}\n".format(*error) # Strict version
"error: line {}: {}\n".format(*error) # Allow types other than int, str
"error: line {}: {!s}\n".format(int(error[0]), error[1]) # Truer to original

There is a related error from <https://bbs.archlinux.org/viewtopic.php?id=199016> (actual error was apparently a missing install file):

remote: Traceback (most recent call last):
remote: File "hooks/update", line 274, in <module>
remote: commit.id)
remote: File "hooks/update", line 175, in die_commit
remote: sys.stderr.write("error: {:s}:\n".format(commit))
remote: TypeError: non-empty format string passed to object.__format__

But from where I am sitting I can’t see what the problem is in this case. The code in the traceback seems to be a mix of old and new code.