Has the sample code from https://github.com/gobuffalo/packr/tree/master/v2 pretty much verbatim. Yet it doesn't work, beyond picking up the filesystem copy only when the resulting executable is run from the build directory (so the "development" mode works, but not the "production" mode).
Current results (with go version 1.11.2):
$ packr2 -v build
DEBU[2018-12-10T22:51:02-05:00] *parser.Parser#NewFromRoots options="{\"IgnoreImports\":false,\"Ignores\":null}" roots="[\"/home/craig/.go/src/github.com/jcburley/trypackr\"]"
DEBU[2018-12-10T22:51:02-05:00] *parser.Parser#NewFromRoots walking=/home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] *parser.finder#findAllGoFilesImports dir=/home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] *parser.finder#findAllGoFiles dir=/home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] *parser.Parser#NewFromRoots found prospects=0
DEBU[2018-12-10T22:51:02-05:00] *parser.Parser#NewFromRoots options="{\"IgnoreImports\":false,\"Ignores\":null}" roots="[\"/home/craig/.go/src/github.com/jcburley/trypackr\"]"
DEBU[2018-12-10T22:51:02-05:00] *parser.Parser#NewFromRoots walking=/home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] *parser.finder#findAllGoFilesImports dir=/home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] *parser.finder#findAllGoFiles dir=/home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] *parser.Parser#NewFromRoots found prospects=0
DEBU[2018-12-10T22:51:02-05:00] found 0 boxes
DEBU[2018-12-10T22:51:02-05:00] *store.Disk#Close
DEBU[2018-12-10T22:51:02-05:00] Step: 7757f35f
DEBU[2018-12-10T22:51:02-05:00] Chdir: /home/craig/.go/src/github.com/jcburley/trypackr
DEBU[2018-12-10T22:51:02-05:00] File: /home/craig/.go/src/github.com/jcburley/trypackr/packrd/packed-packr.go
DEBU[2018-12-10T22:51:02-05:00] go build -v
$ ./trypackr
This is admin/index.html.
$ cd ..
$ ./trypackr/trypackr
2018/12/10 22:56:51 stat /home/craig/.go/src/github.com/jcburley/templates/admin/index.html: no such file or directory
$
Note that the workaround described in gobuffalo/packr#129 fixes this issue.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent