honnef.co/go/tools@v0.5.0-0.dev.0.20240520180541-dcae280a5e87/simple/s1030/testdata/src/example.com/CheckBytesBufferConversions/LintBytesBufferConversions.go (about)

     1  package pkg
     2  
     3  import (
     4  	"bytes"
     5  )
     6  
     7  type AliasByte = byte
     8  type AliasSlice = []byte
     9  type AliasSlice2 = []AliasByte
    10  
    11  func fn() {
    12  	buf := bytes.NewBufferString("str")
    13  	_ = string(buf.Bytes())  //@ diag(`should use buf.String() instead of string(buf.Bytes())`)
    14  	_ = []byte(buf.String()) //@ diag(`should use buf.Bytes() instead of []byte(buf.String())`)
    15  
    16  	m := map[string]*bytes.Buffer{"key": buf}
    17  	_ = string(m["key"].Bytes())  //@ diag(`should use m["key"].String() instead of string(m["key"].Bytes())`)
    18  	_ = []byte(m["key"].String()) //@ diag(`should use m["key"].Bytes() instead of []byte(m["key"].String())`)
    19  
    20  	_ = []AliasByte(m["key"].String()) //@ diag(`should use m["key"].Bytes() instead of []AliasByte(m["key"].String())`)
    21  	_ = AliasSlice(m["key"].String())  //@ diag(`should use m["key"].Bytes() instead of AliasSlice(m["key"].String())`)
    22  	_ = AliasSlice2(m["key"].String()) //@ diag(`should use m["key"].Bytes() instead of AliasSlice2(m["key"].String())`)
    23  
    24  	var m2 map[string]int
    25  	_ = m2[string(buf.Bytes())] // no warning, this is more efficient than buf.String()
    26  
    27  	string := func(_ interface{}) interface{} {
    28  		return nil
    29  	}
    30  	_ = string(m["key"].Bytes())
    31  }