Analyzes Go source code to find places where a pointer to a loop variable is created. This is a common bug. See my blog post for details.
go install github.com/evanj/loopcheck$GOPATH/bin/loopcheck (source code or package)
Code (go playground):
package main
import "fmt"
func main() {
values := []MyStruct{MyStruct{1}, MyStruct{2}, MyStruct{3}}
output := []*MyStruct{}
for _, v := range values {
output = append(output, &v)
}
fmt.Println("output:", output)
}
type MyStruct struct {
number int
}
func (m *MyStruct) String() string {
return fmt.Sprintf("MyStruct{%d}", m.number)
}Output:
example1.go:9: takes address of loop variable: &v
range at line 8: for _, v := range values
Inspired by errcheck: https://github.com/kisielk/errcheck
Also inspired by the range check code in go vet: https://github.com/golang/tools/blob/master/cmd/vet/rangeloop.go