issue21317.go

     1  // run
     2  
     3  //go:build !js && !wasip1 && gc
     4  
     5  // Copyright 2017 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  // As of "Mon 6 Nov 2017", run.go doesn't yet have proper
    10  // column matching so instead match the output manually
    11  // by exec-ing
    12  
    13  package main
    14  
    15  import (
    16  	"fmt"
    17  	"io/ioutil"
    18  	"log"
    19  	"os"
    20  	"os/exec"
    21  	"strings"
    22  )
    23  
    24  func main() {
    25  	f, err := ioutil.TempFile("", "issue21317.go")
    26  	if err != nil {
    27  		log.Fatal(err)
    28  	}
    29  	fmt.Fprintf(f, `
    30  package main
    31  
    32  import "fmt"
    33  
    34  func main() {
    35          n, err := fmt.Println(1)
    36  }
    37  `)
    38  	f.Close()
    39  	defer os.RemoveAll(f.Name())
    40  
    41  	// compile and test output
    42  	cmd := exec.Command("go", "tool", "compile", "-p=main", "-importcfg="+os.Getenv("STDLIB_IMPORTCFG"), f.Name())
    43  	out, err := cmd.CombinedOutput()
    44  	if err == nil {
    45  		log.Fatalf("expected cmd/compile to fail")
    46  	}
    47  	wantErrs := []string{
    48  		"7:9: declared and not used: n",
    49  		"7:12: declared and not used: err",
    50  	}
    51  	outStr := string(out)
    52  	for _, want := range wantErrs {
    53  		if !strings.Contains(outStr, want) {
    54  			log.Fatalf("failed to match %q\noutput: %q", want, outStr)
    55  		}
    56  	}
    57  }
    58
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