cmd/go: breaking change in 1.23rc2 with version constraints in GOPATH mode #68658
Description
Go version
go version go1.23rc2 darwin/amd64
Output of go env in your module/workspace:
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/tmp/.gocache'
GOENV='/Users/rittneje/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/rittneje/gomodtest/pkg/mod'
GONOPROXY='[REDACTED]'
GONOSUMDB='[REDACTED]'
GOOS='darwin'
GOPATH='/Users/rittneje/gomodtest'
GOPRIVATE='[REDACTED]'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/Users/rittneje/sdk/go1.23rc2'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/Users/rittneje/sdk/go1.23rc2/pkg/tool/darwin_amd64'
GOVCS='[REDACTED]'
GOVERSION='go1.23rc2'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/rittneje/Library/Application Support/go/telemetry'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD=''
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/kf/kr7_s3xx0l12zbj3jrn082hmzy5gvy/T/go-build3078931624=/tmp/go-build -gno-record-gcc-switches -fno-common'What did you do?
As a minimal reproduction, we have a repository in GOPATH-mode, organized like so:
- src
- foo
- main.go
- foo
main.go is defined as follows:
//go:build go1.10
package p
import "fmt"
func main() {
var x any
fmt.Println(x)
}What did you see happen?
Compiling with 1.23rc2 fails:
src/foo/main.go:8:8: predeclared any requires go1.18 or later (file declares //go:build go1.10)
What did you expect to see?
It should still work, like it does in 1.22.
(Please note the above is just a minimal reproduction. In reality, the offending go:build directive is in a vendored dependency.)
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