x/tools/cmd/guru: 'definition' cannot show declaration of a local object from a different go file

[zhouhua015]

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

$ go version
go version go1.13.4 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="~/.cache/go-build"
GOENV="~/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="~/Golang"
GOPRIVATE=""
GOROOT="/snap/go/4762"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/snap/go/4762/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="~/Sources/guru-test/go.mod"
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-build198801993=/tmp/go-build -gno-record-gcc-switches"

What did you do?

The following is my testing package

files:

- a.go
- bar.go
- foo
  - b.go
- go.mod

go.mod

module example.com/guru/test

go 1.13

a.go

package guru_test

type FooA struct {
}

bar.go

package guru_test

import "example.com/guru/test/foo"

type FooC struct {
}

func bar() {
        var x FooA
        var y foo.FooB
        var z FooC
}

foo/b.go

package foo

type FooB struct {
}

Try to show declaration of selected identifier for FooA:

~/Sources/guru-test$ guru definition bar.go:#99               
guru: no object for identifier

Try to show declaration of selected identifier for FooB:

~/Sources/guru-test$ guru definition bar.go:#115
~/Sources/guru-test/foo/b.go:3:6: defined here as type example.com/guru/test/foo.FooB

Try to show declaration of selected identifier for FooC:

~/Sources/guru-test$ guru definition bar.go:#127
~/Sources/guru-test/bar.go:5:6: defined here as type FooC

What did you expect to see?

Show declaration FooA should give:

~/Sources/guru-test$ guru definition bar.go:#99    
~/Sources/guru-test/a.go:3:6: defined here as type FooA

What did you see instead?

~/Sources/guru-test$ guru definition bar.go:#99               
guru: no object for identifier