英文:
How to detect error values that are never used
问题
我正在寻找一种方法来查找不处理第一个错误的错误"handling"的出现：
示例：
func handler() {
var myErr error
myErr = doSomething() //请提醒我这个
myErr = doSomethingElse()
if myErr != nil {
return
}
}
func doSomething() error {
return errors.New("an example error")
}
func doSomethingElse() error {
return errors.New("an example error")
}
我希望在第一次调用svc.DoSomething()后警告我没有使用错误，因为它被有效地覆盖和忽略了。
我尝试在Goland 2021.3中启用所有代码检查，并尝试了staticcheck，并搜索了现有的代码检查工具。
我相信它应该在第一次调用svc.DoSomething()后显示SA4006，这在VSCode中可以正常工作。
英文:
I'm looking for a way to to find occurrences of this error "handling" that doesn't do anything with the first error:
example:
func handler() {
var myErr error
myErr = doSomething() //Warn me about this please
myErr = doSomethingElse()
if myErr != nil {
return
}
}
func doSomething() error {
return errors.New("an example error")
}
func doSomethingElse() error {
return errors.New("an example error")
}
I would like to be warned that I haven't used the error after the first call to svc.DoSomething() because its effectively overwritten and ignored.
I have tried enabling all code inspections in goland 2021.3 and have tried staticcheck and have searched for an existing linter.
I believe it should show SA4006 after the first call to svc.DoSomething() which works fine in VSCode.
答案1
得分: 2
我建议使用ineffassign linter：https://github.com/gordonklaus/ineffassign
它可以作为一个独立的工具使用，也可以通过golangci-lint使用：https://golangci-lint.run/usage/linters/
它不仅会检查错误，还会检查所有无用的赋值（即后续没有使用的赋值），就像你的例子中一样。
英文:
I'd suggest the ineffassign linter: https://github.com/gordonklaus/ineffassign
It can be used as a standalone tool or via golangci-lint: https://golangci-lint.run/usage/linters/
It's not gonna check only for error, but for all useless assignments (ie that aren't used latter on) like in your example.
答案2
得分: -1
VSCode做了同样的事情。
在我使用这个变量之后：
文档：https://pkg.go.dev/golang.org/x/tools/internal/typesinternal#UnusedVar
诊断工具：https://github.com/golang/vscode-go/wiki/tools#diagnostics
英文:
VSCode does the same thing.
After I use this variable:
Doc: https://pkg.go.dev/golang.org/x/tools/internal/typesinternal#UnusedVar
Diagnostic Tools: https://github.com/golang/vscode-go/wiki/tools#diagnostics
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