While investigating more efficient ways to evaluate new test scripts, the following issue showed up. It looks related to similar cmd/go issues opened recently. I suppose that a module is produced and not an exe seen the size in dir cantcompile :

09-08-18  18:25    <DIR>          .
09-08-18  18:25    <DIR>          ..
09-08-18  18:25             2.902 cantcompile
09-08-18  18:23               106 cantcompile.go

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

go version go1.11beta3 windows/amd64

Does this issue reproduce with the latest release?

I did not try tip

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

set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\()\AppData\Local\go-build
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\Users\()\Documents\Google\
set GOPROXY=
set GORACE=
set GOROOT=C:\Go
set GOTMPDIR=
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set CXX=g++
set CGO_ENABLED=0
set GOMOD=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\Costa\)\Local\Temp\go-build007169846=/tmp/go-build -gno-record-gcc-switches

What did you do?

I tried several parameters configuration with always the same result where -x -v -work do not provide much information. Work directories are empty at best:
go build -x -v -work -i -o cantcompile.exe
go build -x -v -work -o cantcompile -i
and go build -i produces nothing.

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.

package cantcompile

import "fmt"

func main() {
	fmt.Println("can't compile if package is not main ?")
}

A link on play.golang.org is best.

What did you expect to see?

Some error message during build probably.

What did you see instead?

An executable is produced and if you try running it, you receive a message from very very old days.