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range over func: it is NOT yet permitted to omit unwanted variables #67075

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gaissmai opened this issue Apr 26, 2024 · 1 comment
Closed

range over func: it is NOT yet permitted to omit unwanted variables #67075

gaissmai opened this issue Apr 26, 2024 · 1 comment

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@gaissmai
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Go version

gotip

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/gaissmai/.cache/go-build'
GOENV='/home/gaissmai/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/gaissmai/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/gaissmai/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/gaissmai/sdk/gotip'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/home/gaissmai/sdk/gotip/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='devel go1.23-b384ee7ce Fri Apr 26 18:12:56 2024 +0000'
GODEBUG=''
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/home/gaissmai/project/rangefunc/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build4171176773=/tmp/go-build -gno-record-gcc-switches'

What did you do?

playing with range over funcs, got the following error:
range over all (value of type func(yield func(a int, b int) bool)) must have two iteration variables
please see the code in the playground: https://go.dev/play/p/HHJaatn3WAl?v=gotip

What did you see happen?

got the compiler error:
./prog.go:14:17: range over all (value of type func(yield func(a int, b int) bool)) must have two iteration variables

What did you expect to see?

no compiler error, the spec says it is allowed to omit unwanted variables:

for x, y := range f { ... }
for x, _ := range f { ... }
for _, y := range f { ... }
for x := range f { ... }
for range f { ... }
@gaissmai gaissmai mentioned this issue Apr 26, 2024
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@seankhliao
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Duplicate of #65236

@seankhliao seankhliao marked this as a duplicate of #65236 Apr 26, 2024
@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Apr 26, 2024
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2 participants
@gaissmai @seankhliao