Unable to decompress valid zstd content

[klauspost]

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

λ go version
go version go1.17.6 windows/amd64

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

λ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=d:\temp\gocache
set GOENV=C:\Users\klaus\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=e:\gopath\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=e:\gopath
set GOPRIVATE=
set GOPROXY=https://goproxy.io,goproxy.dev,direct
set GOROOT=c:\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.17.6
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=e:\gopath\src\github.com\DataDog\test\go.mod
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=d:\temp\wintemp\go-build2972969431=/tmp/go-build -gno-record-gcc-switches

What did you do?

Unpack reproducer: reproducer.zip
Execute go run .

What did you expect to see?

No error.

λ zstd -V
*** zstd command line interface 64-bits v1.5.0, by Yann Collet ***
λ zstd -d cba1cf2f889881b4c91d22895e66836dc20ac1d6.zst
cba1cf2f889881b4c91d22895e66836dc20ac1d6.zst: 872 bytes

What did you see instead?

λ go run .
panic: unexpected EOF

goroutine 1 [running]:
main.main()
        e:/gopath/src/github.com/DataDog/test/main.go:14 +0xa5
exit status 2

[Viq111]

(Doing a bit of cleanup on issues, I haven't forgotten those, just waiting on more guidance from upstream (facebook/zstd#3089) to see whether the DataDog/zstd output (error on extra bytes) or the zstd cli (silenced error) is the correct call here. I'm leaning towards keeping the behavior for now and see whether guidance changes