:Gclog in cygwin vim causes fatal error

[3N4N]

fatal: Not a valid object name cc69cf356c65b9da1419cfbbf7a5b7fc28ff9b3f;path\file.txt

That's the error I get when I run :0Gclog on path/file.txt. This happens only on my cygwin build of Vim (msys build, to be exact), not on the native win32 build.

[tpope]

How exactly does that error present itself? In the quickfix list? On the command line? When you open a result? Is it highlighted in red? Is there a stack trace or other additional context?