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x/tools/cmd/godoc: generics: type parameter incorrectly linked #50717

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synenka opened this issue Jan 20, 2022 · 1 comment
Open

x/tools/cmd/godoc: generics: type parameter incorrectly linked #50717

synenka opened this issue Jan 20, 2022 · 1 comment
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NeedsFix The path to resolution is known, but the work has not been done. Tools This label describes issues relating to any tools in the x/tools repository.
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Unreleased

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@synenka
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synenka commented Jan 20, 2022

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

$ go version

go version go1.18beta1 darwin/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="/Users/olenasynenka/Library/Caches/go-build"

GOENV="/Users/olenasynenka/Library/Application Support/go/env"

GOEXE=""

GOEXPERIMENT=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GOINSECURE=""

GOMODCACHE="/Users/olenasynenka/go/pkg/mod"

GONOPROXY=""

GONOSUMDB=""

GOOS="darwin"

GOPATH="/Users/olenasynenka/go"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/Users/olenasynenka/sdk/go1.18beta1"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/Users/olenasynenka/sdk/go1.18beta1/pkg/tool/darwin_amd64"

GOVCS=""

GOVERSION="go1.18beta1"

GCCGO="gccgo"

GOAMD64="v1"

AR="ar"

CC="clang"

CXX="clang++"

CGO_ENABLED="1"

GOMOD="/Users/olenasynenka/go/src/generics/go.mod"

GOWORK=""

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/f8/xmg0swjx04jfwc7zln05fxlh0000gn/T/go-build495723722=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I created a generic function F with type parameter "T" and a separate struct called “T”.
Then I run cmd/godoc to view it’s documentation.

Steps to reproduce:

mkdir /tmp/test
cd /tmp/test
go mod init test
echo 'package test; func F[T any](t T) {}; type T struct{}' > test.go
go install golang.org/x/tools/cmd/godoc@latest
godoc
# In browser navigate to localhost:6060/pkg/test

What did you expect to see?

Documentation of generic func F with type param “T” used in parameter list. Type “T” doesn’t link anywhere.

What did you see instead?

Type parameter “T” is rendered with a hyper-link that links to incorrect type (struct "T").
This should not happen as struct “T” and type parameter “T” are different entities.
Screenshot
@gopherbot gopherbot added the Tools This label describes issues relating to any tools in the x/tools repository. label Jan 20, 2022
@gopherbot gopherbot added this to the Unreleased milestone Jan 20, 2022
@heschi heschi added the NeedsFix The path to resolution is known, but the work has not been done. label Jan 21, 2022
@gopherbot
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Change https://golang.org/cl/382714 mentions this issue: godoc: handle type parameters correctly in LinkifyText

gopherbot pushed a commit to golang/tools that referenced this issue Feb 14, 2022
@aarzilli @findleyr
godoc: handle type parameters correctly in LinkifyText
c6fca02 
LinkifyText should not generate links to global declarations for
identifiers that are type parameters.

Because the syntactic resolver does not record the declaration for type
parameters declared in the method receiver (see
https://golang.org/issue/50956) a name lookup is used as a workaround.
This is fine here because it is only applied to undeclared indentifiers
and LinkifyText is only ever called on a single declaration at a time,
not on a full AST.

Updates golang/go#50717

Change-Id: I32f2203ce80c060ee18ca8b964a2d5fd80f41957
Reviewed-on: https://go-review.googlesource.com/c/tools/+/382714
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Alessandro Arzilli <alessandro.arzilli@gmail.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Peter Weinberger <pjw@google.com>
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