Go 1.4.3 failing on core-updates

[Leo Famulari]

Go version 1.4.3, which is required to build the latest Go version, is
failing to build on core-updates:

https://hydra.gnu.org/build/1493335

Here's the tail of the log:
------
archive/tar
go/doc
crypto/elliptic
cmd/addr2line
encoding/asn1
crypto/rand
crypto/dsa
cmd/cgo
go/format
crypto/rsa
cmd/fix
cmd/gofmt
go/build
crypto/ecdsa
crypto/x509/pkix
cmd/nm
cmd/objdump
cmd/pprof/internal/plugin
html/template
cmd/pprof/internal/symbolizer
cmd/pprof/internal/symbolz
cmd/yacc
archive/zip
cmd/pprof/internal/report
compress/lzw
compress/zlib
database/sql/driver
database/sql
encoding/csv
encoding/gob
image/gif
image/png
runtime/debug
testing
testing/iotest
cmd/pprof/internal/commands
testing/quick
text/scanner
cmd/pprof/internal/driver
runtime/cgo
net
os/user
# net
cannot load DWARF output from $WORK/net/_obj//_cgo_.o: decoding dwarf section 
info at offset 0x4: unsupported version 0
# os/user
cannot load DWARF output from $WORK/os/user/_obj//_cgo_.o: decoding dwarf 
section info at offset 0x4: unsupported version 0
phase `build' failed after 15.9 seconds
builder for `/gnu/store/gs9r320hhlmi87k3xbswng57icxsxv4n-go-1.4.3.drv' failed 
with exit code 1
@ build-failed /gnu/store/gs9r320hhlmi87k3xbswng57icxsxv4n-go-1.4.3.drv - 1 
builder for `/gnu/store/gs9r320hhlmi87k3xbswng57icxsxv4n-go-1.4.3.drv' failed 
with exit code 1
guix build: error: build failed: build of 
`/gnu/store/gs9r320hhlmi87k3xbswng57icxsxv4n-go-1.4.3.drv' failed
------

Any ideas?