proposal: Go 2: Error-Handling Paradigm with !err Grammar Sugar

[xiaokentrl]

Hi, if you like this idea please give a heart emoji to me, Thank you very much

package main
 
import (
    "fmt"
    "os"
)
 
func main() {
	/*
	func demo(){
	    file, err := os.Create("example.txt") 
	    if err != nil {
	        return nil, err
	    }
	    defer file.Close()
	}

       if  dd, err  := demo( ); err != nil {
            fmt.Printf( "dd" )
       }
	*/

	func demo_1(){
	    file := os.Create("example.txt").checkError( return , nil , err )     
	    defer file.Close()
            
           //   when【 .checkError( )   】 appears，auto append    file , err := os.Create("example.txt")
           //   when【 .checkError( return , nil , err )   】 appears，auto append  if err != nil 

	}
                          
	func demo_2(){
	    file := os.Create("example.txt").checkError( panic )
	    defer file.Close()
	}

	func demo_3(){
	    file := os.Create("example.txt").checkError( return , func(){
                return 2 + 3 , nil
            })
	    defer file.Close()
	}

	if dd := demo_1(); dd.hasError {         //  dd , err  := demo_1();  if err != nil
            fmt.Printf( "dd  hasError" )
            return
           //   when【 .hasError 】 appears，auto append    file , err := os.Create("example.txt")
           //   when【 .hasError 】appears，auto append  if err != nil 
	}
	fmt.Printf( "dd" )

}


or 

	func demo_1(){
	    file := os.Create("example.txt").checkError( return , nil , err )     // checkError( )  have "( )"
	    defer file.Close()
	}

        if dd := demo_1(); dd.checkError {    //checkError  not have "( )"

        }


or   


file := os.Create("example.txt").errReturn( return , nil , err ) 
// when【 .errReturn】 appears,  compiler auto append    " file , err := os.Create("example.txt")  "


       

[xiaokentrl]

file := os.Create("example.txt").errReturn( nil , err )

if dd := demo( ); dd.hasErr {
    fmt.Printf( "has Error" )
}

file := os.Create("example.txt").err (  return ， nil , err )

if dd := demo( ); dd.err ? {
    fmt.Printf( "has Error" )
}

[seankhliao]

Please fill out https://github.com/golang/proposal/blob/master/go2-language-changes.md when proposing language changes

[adonovan]

This appears to be a duplicate of #63621. Please continue the discussion there.