Go 1.16.3 and Go 1.15.11 are released

Hello gophers,

We have just released Go versions 1.16.3 and 1.15.11, minor point releases.

View the release notes for more information:
    https://golang.org/doc/devel/release.html#go1.16.minor

You can download binary and source distributions from the Go web site:
    https://golang.org/dl/

To compile from source using a Git clone, update to the release with
"git checkout go1.16.3" and build as usual.

Thanks to everyone who contributed to the releases.

Cheers,
Carlos, David, Dmitri and Alex for the Go team

Cleared everything ($ go clean -cache -modcache -testcache ; rm -rf ~/pkg ~/.cache/go-build) and upgraded from 1.15.10 to 1.16.3. Now I am seeing while hacking some current project:

jnml@3900x:~/src/modernc.org/qbe$ go test
# runtime
/usr/local/go/src/runtime/mgcsweepbuf.go:87:80: memstats.gc_sys undefined (type mstats has no field or method gc_sys)
/usr/local/go/src/runtime/mgcsweepbuf.go:106:102: memstats.gc_sys undefined (type mstats has no field or method gc_sys)
FAIL modernc.org/qbe [build failed]
jnml@3900x:~/src/modernc.org/qbe$ go version
go version go1.16.3 linux/amd64
jnml@3900x:~/src/modernc.org/qbe$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/jnml/.cache/go-build"
GOENV="/home/jnml/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/jnml/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/jnml"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.16.3"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/jnml/src/modernc.org/qbe/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 -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1728759906=/tmp/go-build -gno-record-gcc-switches"
jnml@3900x:~/src/modernc.org/qbe$
Any ideas what's wrong? Thanks in advance.