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

$ go version
go1.13.1 windows/amd64

Does this issue reproduce with the latest release?

yes

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

$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\xxx\AppData\Local\go-build
set GOENV=C:\Users\xxx\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Projects
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=c:\temp\go-build495912386=/tmp/go-build -gno-record-gcc-switches

What did you do?

Just used local import in my project main file like:
import "./my_local_package"
"my_local_package" imports another non-local package

What did you expect to see?

Expect succefull build

What did you see instead?

unexpected directory layout:
        import path: _/C_/Projects/src/checkerr/my_local_package
        root: C:\Project\src
        dir: C:\Project\src\checkerr\my_local_package
        expand root: C:\Project\src
        expand dir: C:\Project\src\checkerr\my_local_package
        separator: \

I made some research. I'm sure it happens here:
https://github.com/golang/go/blob/release-branch.go1.13/src/cmd/go/internal/load/pkg.go#L879

Because function build.IsLocalImport checks psedo-import path

"_/C_/Projects/src/checkerr/my_local_package"

"./my_local_package"