cmd/go: In PowerShell parsing fails for -coverprofile w/ file w/ extension (e.g. c.out)

[jfoshee]

Go version

go version go1.24.0 windows/amd64

Output of go env in your module/workspace:

set AR=ar
set CC=gcc
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_ENABLED=0
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set CXX=g++
set GCCGO=gccgo
set GO111MODULE=
set GOAMD64=v1
set GOARCH=amd64
set GOAUTH=netrc
set GOBIN=
set GOCACHE=C:\Users\JacobFoshee\AppData\Local\go-build
set GOCACHEPROG=
set GODEBUG=
set GOENV=C:\Users\JacobFoshee\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFIPS140=off
set GOFLAGS=
set GOGCCFLAGS=-m64 -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\JACOBF~1\AppData\Local\Temp\go-build2346486107=/tmp/go-build -gno-record-gcc-switches
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMOD=C:\Source\keyman\go.mod
set GOMODCACHE=C:\Users\JacobFoshee\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\JacobFoshee\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTELEMETRY=local
set GOTELEMETRYDIR=C:\Users\JacobFoshee\AppData\Roaming\go\telemetry
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.24.0
set GOWORK=
set PKG_CONFIG=pkg-config

What did you do?

Using Windows PowerShell, executing:

go test -coverprofile=c.out

Produces the output:

# .out
no required module provides package .out; to add it:
        go get .out
FAIL    .out [setup failed]
FAIL

If I remove the file extension, it works fine, e.g.:

go test -coverprofile=coverage

If I run the command in a Bash shell on the same system it works as advertised.

What did you see happen?

go test -coverprofile=c.out 
# .out
no required module provides package .out; to add it:
        go get .out
FAIL    .out [setup failed]
FAIL

What did you expect to see?

go test -coverprofile=c.out
PASS
coverage: 73.9% of statements
ok      github.com/jfoshee/keyman/keyman        0.370s

[seankhliao]

This is a powershell bug PowerShell/PowerShell#6291

[jfoshee]

Ah, thank you. And thanks for including the reference. 🙏