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cmd/vet: method Seek() should have signature Seek(int64, int) #36970

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@sabey

Description

@sabey

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

$ go version
go version go1.13.6 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
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/jackson/.cache/go-build"
GOENV="/home/jackson/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/jackson/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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-build498302187=/tmp/go-build -gno-record-gcc-switches"

What did you do?

func (self *File) Seek(
	offset int64,
) (
	io.Reader,
	error,
) {
	return nil, nil
}

go vet

What did you expect to see?

no error

I do have the package "io" included, but I do also have a Read and Write method which go vet does not complain about

What did you see instead?

./file.go:286:19: method Seek(offset int64) (io.Reader, error) should have signature Seek(int64, int) (int64, error)

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    AnalysisIssues related to static analysis (vet, x/tools/go/analysis)NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.

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