text/template: Unexpected assignment #56490
Description
What version of Go are you using (go version)?
go version go1.19.2 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
GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/home/jmooring/.cache/go-build" GOENV="/home/jmooring/.config/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOINSECURE="" GOMODCACHE="/home/jmooring/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="linux" GOPATH="/home/jmooring/go" GOPRIVATE="" GOPROXY="https://proxy.golang.org" GOROOT="/snap/go/current" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/snap/go/current/pkg/tool/linux_amd64" GOVCS="" GOVERSION="go1.19.2" GCCGO="gccgo" GOAMD64="v1" AR="ar" CC="gcc" CXX="g++" CGO_ENABLED="1" GOMOD="/home/jmooring/code/go-sandbox/go.mod" GOWORK="" 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 -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3041838949=/tmp/go-build -gno-record-gcc-switches"
What did you do?
This works as expected (stdout is 3):
import (
"os"
"text/template"
)
func main() {
a := [3]int{1, 2, 3}
t := `
{{- $x := 0 }}
{{- $i := 0 }}
{{- range $i = . }}
{{- end }}
{{- $i }}
`
tmpl, err := template.New("test").Parse(t)
if err != nil {
panic(err)
}
err = tmpl.Execute(os.Stdout, a)
if err != nil {
panic(err)
}
}Now, reverse the order of the first two lines of the template:
import (
"os"
"text/template"
)
func main() {
a := [3]int{1, 2, 3}
t := `
{{- $i := 0 }}
{{- $x := 0 }}
{{- range $i = . }}
{{- end }}
{{- $i }}
`
tmpl, err := template.New("test").Parse(t)
if err != nil {
panic(err)
}
err = tmpl.Execute(os.Stdout, a)
if err != nil {
panic(err)
}
}Stdout is [1 2 3], but it should be 3.
Same issue with html/template.