From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ben Woodcroft <b.woodcroft@uq.edu.au>
Subject: corrupt file on mirror?
Date: Thu, 6 Apr 2017 13:29:21 +1000
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Hi,

I just came across this, not sure what to make of it:

Found valid signature for 
/gnu/store/dhc2iy059hi91fk55dcv79z09kp6500y-gcc-5.4.0-lib
>From 
https://mirror.hydra.gnu.org/guix/nar/gzip/dhc2iy059hi91fk55dcv79z09kp6500y-gcc-5.4.0-lib
Downloading dhc2iy...-gcc-5.4.0-lib (30.1MiB installed)...
  gcc-5.4.0-lib 189KiB/s 00:01 | 187KiB transferred
gzip: stdin: invalid compressed data--crc error

gzip: stdin: invalid compressed data--length error
guix substitute: error: corrupt input while restoring 
'/gnu/store/dhc2iy059hi91fk55dcv79z09kp6500y-gcc-5.4.0-lib/lib/gcc/x86_64-unknown-linux-gnu/5.4.0/include/cilk/cilk_api.h' 
from #{read pipe}#

Any ideas?
Thanks, ben