x/blog: in /wire blog post, go generate example not working (?)

[jeffdahl]

What version of Go are you using (go version)?

$ go version
go version go1.14.3 linux/amd64

Does this issue reproduce with the latest release?

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/nas/jeff/.cache/go-build"
GOENV="/nas/jeff/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/nas/jeff/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build483193468=/tmp/go-build -gno-record-gcc-switches"

What did you do?

go generate did nothing, while wire worked.

What did you expect to see?

A wire generated file.

What did you see instead?

No wire generated file.

[ALTree]

Hi,

What did you do?

go generate did nothing, while wire worked.

I'm not sure what this means. Can you add more details (are you reading a blog post on blog.golang.org? Which one?)?

[D1CED]

This one most likely: https://blog.golang.org/wire

But the example fails intentionally. So did OP copy the fix?

[jeffdahl]

Yes, I was following the example at https://blog.golang.org/wire where it states:
`Now we run go generate to execute wire:

$ go generate
wire.go:2:10: inject initUserStore: no provider found for ConnectionInfo (required by provider of *mysql.DB)
wire: generate failed`

At this point, I did not realize one is required to run wire before go generate.

[dmitshur]

It seems that error is expected. The next paragraph says:

Oops! We didn't include a ConnectionInfo or tell Wire how to build one. Wire helpfully tells us the line number and types involved. We can either add a provider for it to wire.Build, or add it as an argument:

[...]

Now go generate will create a new file with the generated code:

Did you follow those steps?

Also, what's the output if you run go generate -x?