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x/tools/gopls: data corruption on save #59554

@josharian

Description

@josharian

gopls version

$ gopls -v version
Build info
----------
golang.org/x/tools/gopls v0.11.0
    golang.org/x/tools/gopls@v0.11.0 h1:/nvKHdTtePQmrv9XN3gIUN9MOdUrKzO/dcqgbG6x8EY=
    github.com/BurntSushi/toml@v1.2.1 h1:9F2/+DoOYIOksmaJFPw1tGFy1eDnIJXg+UHjuD8lTak=
    github.com/google/go-cmp@v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
    github.com/sergi/go-diff@v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
    golang.org/x/exp@v0.0.0-20221031165847-c99f073a8326 h1:QfTh0HpN6hlw6D3vu8DAwC8pBIwikq0AI1evdm+FksE=
    golang.org/x/exp/typeparams@v0.0.0-20221031165847-c99f073a8326 h1:fl8k2zg28yA23264d82M4dp+YlJ3ngDcpuB1bewkQi4=
    golang.org/x/mod@v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
    golang.org/x/sync@v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
    golang.org/x/sys@v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A=
    golang.org/x/text@v0.4.0 h1:BrVqGRd7+k1DiOgtnFvAkoQEWQvBc25ouMJM6429SFg=
    golang.org/x/tools@v0.3.1-0.20221213193459-ca17b2c27ca8 h1:7/HkGkN/2ktghBCSRRgp31wAww4syfsW52tj7yirjWk=
    golang.org/x/vuln@v0.0.0-20221109205719-3af8368ee4fe h1:qptQiQwEpETwDiz85LKtChqif9xhVkAm8Nhxs0xnTww=
    honnef.co/go/tools@v0.3.3 h1:oDx7VAwstgpYpb3wv0oxiZlxY+foCpRAwY7Vk6XpAgA=
    mvdan.cc/gofumpt@v0.4.0 h1:JVf4NN1mIpHogBj7ABpgOyZc65/UUOkKQFkoURsz4MM=
    mvdan.cc/xurls/v2@v2.4.0 h1:tzxjVAj+wSBmDcF6zBB7/myTy3gX9xvi8Tyr28AuQgc=
go: go1.20

go env

$ go env
GO111MODULE=""
GOARCH="arm64"
GOBIN="/Users/josh/bin"
GOCACHE="/Users/josh/Library/Caches/go-build"
GOENV="/Users/josh/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/josh/pkg/mod"
GONOPROXY="github.com/canopyclimate/www"
GONOSUMDB="github.com/canopyclimate/www"
GOOS="darwin"
GOPATH="/Users/josh"
GOPRIVATE="github.com/canopyclimate/www"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/josh/go/1.20"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/josh/go/1.20/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.20.3"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
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 -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/73/xx0jgm0j5ws5lqb8qngnqwc40000gn/T/go-build3159536453=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Put this code into a file (not using VSCode):

package main

func Match(data []byte) int {
//line :1
	var idx = ^uint(0)
	_ = idx
	return -1
}

Open in VSCode. Save (with formatting).

What did you expect to see?

No changes.

What did you see instead?

pge m:ain

func Match(data []byte) int {
//line :1
	var idx = ^uint(0)
	_ = idx
	return -1
}

This doesn't reproduce from the command line using gofmt or gofumpt or goimports.

Editor and settings

Some possibly(?) relevant snippets:

  "go.useLanguageServer": true,

  "gopls": {
    "formatting.gofumpt": true,
  },

  "editor.formatOnSave": true,

  "[go]": {
    "editor.defaultFormatter": "golang.go"
  },

  "go.formatTool": "goimports",

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    FrozenDueToAgeToolsThis label describes issues relating to any tools in the x/tools repository.goplsIssues related to the Go language server, gopls.

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