can only use path@version syntax with 'go get' and 'go install' in module-aware mode

[hentzels]

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

$ go version
go version go1.16 darwin/amd64

Does this issue reproduce with the latest release?

$ brew upgrade go
Warning: go 1.16 already installed
yes, leatest version
and like described in help: go.mod in the same folder where started the build command

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

go env Output

$ go env
GO111MODULE="auto"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/xyzuser/Library/Caches/go-build"
GOENV="/Users/xyzuser/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/xyzuser/go/pkg/mod"
GONOPROXY="github..com"
GONOSUMDB="github..com"
GOOS="darwin"
GOPATH="/Users/xyzuser/go"
GOPRIVATE="github..com"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.16/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.16/libexec/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/xyzuser/go/src/github..com/coligo/cli/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 -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/hy/jp5519wj523cnntg7f_cstb00000gn/T/go-build1458645750=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

import (
conditions "@//"
)

What did you expect to see?

running build

What did you see instead?

no compile error any more but an runtime error:
err:
imports @//: can only use path@version syntax with 'go get' and 'go install' in module-aware mode

[seankhliao]

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