A problem about debug, can't watch a expression call str.String() the str is a var :strings.Builder.

[OrdinaryYZH]

What version of Go, VS Code & VS Code Go extension are you using?

Version Information

• Run go version to get version of Go from the VS Code integrated terminal.
  • go version go1.19.2 windows/amd64
• Run gopls -v version to get version of Gopls from the VS Code integrated terminal.
  • Build info

---

golang.org/x/tools/gopls v0.10.0
golang.org/x/tools/gopls@v0.10.0 h1:OGrMgGUl9LWTPaeN5ML3SotSguhrdMHbWevtM8cYN6s=
github.com/BurntSushi/toml@v1.2.0 h1:Rt8g24XnyGTyglgET/PRUNlrUeu9F5L+7FilkXfZgs0=
github.com/google/go-cmp@v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
github.com/sergi/go-diff@v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
golang.org/x/exp@v0.0.0-20220722155223-a9213eeb770e h1:+WEEuIdZHnUeJJmEUjyYC2gfUMj69yZXw17EnHg/otA=
golang.org/x/exp/typeparams@v0.0.0-20220722155223-a9213eeb770e h1:7Xs2YCOpMlNqSQSmrrnhlzBXIE/bpMecZplbLePTJvE=
golang.org/x/mod@v0.6.0 h1:b9gGHsz9/HhJ3HF5DHQytPpuwocVTChQJK3AvoLRD5I=
golang.org/x/sync@v0.0.0-20220722155255-886fb9371eb4 h1:uVc8UZUe6tr40fFVnUP5Oj+veunVezqYl9z7DYw9xzw=
golang.org/x/sys@v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
golang.org/x/text@v0.4.0 h1:BrVqGRd7+k1DiOgtnFvAkoQEWQvBc25ouMJM6429SFg=
golang.org/x/tools@v0.2.1-0.20221028182455-bd7d62852469 h1:N4UYjGjl5FFK3cn1CiPnWdTiLe3SjfprMLDNiYh+0Fc=
golang.org/x/vuln@v0.0.0-20221010193109-563322be2ea9 h1:KaYZQUtEEaV8aVADIHAuYBTjo77aUcCvC7KTGKM3J1I=
honnef.co/go/tools@v0.3.3 h1:oDx7VAwstgpYpb3wv0oxiZlxY+foCpRAwY7Vk6XpAgA=
mvdan.cc/gofumpt@v0.3.1 h1:avhhrOmv0IuvQVK7fvwV91oFSGAk5/6Po8GXTzICeu8=
mvdan.cc/xurls/v2@v2.4.0 h1:tzxjVAj+wSBmDcF6zBB7/myTy3gX9xvi8Tyr28AuQgc=
go: go1.19.2

• Run code -v or code-insiders -v to get version of VS Code or VS Code Insiders.

  • 1.72.2
    d045a5eda657f4d7b676dedbfa7aab8207f8a075
    x64

• Check your installed extensions to get the version of the VS Code Go extension

  • v0.35.2

• Run Ctrl+Shift+P (Cmd+Shift+P on Mac OS) > Go: Locate Configured Go Tools command.

  • Checking configured tools....
    GOBIN: undefined
    toolsGopath:
    gopath: F:\Code\go
    GOROOT: C:\Program Files\Go
    PATH: C:\Program Files\Java\jdk1.8.0_181\bin;C:\Program Files\Java\jdk1.8.0_181\jre\bin;C:\CTEX\UserData\miktex\bin;C:\CTEX\MiKTeX\miktex\bin;C:\CTEX\CTeX\ctex\bin;C:\CTEX\CTeX\cct\bin;C:\CTEX\CTeX\ty\bin;C:\CTEX\Ghostscript\gs9.05\bin;C:\CTEX\GSview\gsview;C:\CTEX\WinEdt;C:\Program Files\Intel\WiFi\bin;C:\Program Files\Common Files\Intel\WirelessCommon;C:\Program Files\nodejs;C:\Program Files\nodejs;E:\software\ffmpeg-4.2.2-win64-static\bin;C:\Program Files\Microsoft VS Code\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0;C:\WINDOWS\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Go\bin;C:\Ruby23-x64\bin;C:\Users\yao\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\Intel\WiFi\bin;C:\Program Files\Common Files\Intel\WirelessCommon;C:\Users\yao\AppData\Roaming\npm;C:\Program Files\nodejs;C:\Users\yao\go\bin

  go: C:\Program Files\Go\bin\go.exe: go version go1.19.2 windows/amd64

  gotests: F:\Code\go\bin\gotests.exe (version: v1.6.0 built with go: go1.19.2)
  gomodifytags: F:\Code\go\bin\gomodifytags.exe (version: v1.16.0 built with go: go1.19.2)
  impl: F:\Code\go\bin\impl.exe (version: v1.1.0 built with go: go1.19.2)
  goplay: F:\Code\go\bin\goplay.exe (version: v1.0.0 built with go: go1.19.2)
  dlv: F:\Code\go\bin\dlv.exe (version: v1.9.1 built with go: go1.19.2)
  staticcheck: F:\Code\go\bin\staticcheck.exe (version: v0.3.3 built with go: go1.19.2)
  gopls: F:\Code\go\bin\gopls.exe (version: v0.10.0 built with go: go1.19.2)

go env
Workspace Folder (src): f:\Code\go\src
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\yao\AppData\Local\go-build
set GOENV=C:\Users\yao\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=F:\Code\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=F:\Code\go
set GOPRIVATE=
set GOPROXY=https://goproxy.cn,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.19.2
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=NUL
set GOWORK=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=C:\Users\yao\AppData\Local\Temp\go-build464609539=/tmp/go-build -gno-record-gcc-switches

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Run Preferences: Open Settings (JSON) command to open your settings.json file.
Share all the settings with the go. or ["go"] or gopls prefixes.

Describe the bug

I want to check a expression in my program, the expression is call str.String(), the str is a var :strings.Builder.

It tips me "Unable to evaluate expression: cannot use str.String as argument b in function strings.(*Builder).String: stack object passed to escaping pointer: b"

The detail pls look at the screenshot

I asked somebody, they said it is ok in Goland, so I don't konw is it a bug or not surpport in vscode

Steps to reproduce the behavior:

Screenshots or recordings

[findleyr]

It looks like this is a known limitation of calling functions in watch expressions: golang/go#21678 (comment)

Closing as this is a known limitation of the runtime, and is out of scope for the vscode-go project. As a workaround, you can (of course) assign str.String() to a variable. Sorry.