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proposal: Go 2: When dealing with err, add a wildcard #50207

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misaka123456 opened this issue Dec 16, 2021 · 1 comment
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proposal: Go 2: When dealing with err, add a wildcard #50207

misaka123456 opened this issue Dec 16, 2021 · 1 comment
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error-handling Language & library change proposals that are about error handling. FrozenDueToAge LanguageChange Proposal
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Proposal

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@misaka123456
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misaka123456 commented Dec 16, 2021 •
edited 

  err := func()
  if err != nil {
     return errpkg.Wrap(err)
  }

can change it to
~ = fun()

相当于如果~的类型为error，并且A()的返回值为error，并且~不为nil，这自动转换为 return errpkg.Wrap(err)
Equivalent to if the type of ~ is error, and the return value of A() is error, and ~ is not nil, this is automatically converted to return errpkg Wrap(err)

for example

fun A() error {
  ~ = fun()
}
// 相当于，Equivalent to
fun A() error {
  err := func()
  if err != nil {
     return errpkg.Wrap(err)
  }
}

fun A() (user error) {
  ~ = fun()
}
// 相当于，Equivalent to
fun A() error {
  err := func()
  if err != nil {
     return nil, errpkg.Wrap(err)
  }
}
@gopherbot gopherbot added this to the Proposal milestone Dec 16, 2021
@misaka123456 misaka123456 changed the title proposal: Go 2: proposal: Go 2: When dealing with err, add a wildcard Dec 16, 2021
@randall77
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Dup of #42214 using a different token.

@ianlancetaylor ianlancetaylor added error-handling Language & library change proposals that are about error handling. LanguageChange labels Dec 17, 2021
@seankhliao seankhliao mentioned this issue Apr 16, 2022
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@switchupcb switchupcb mentioned this issue Apr 18, 2022
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error-handling Language & library change proposals that are about error handling. FrozenDueToAge LanguageChange Proposal
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@ianlancetaylor @randall77 @gopherbot @misaka123456