"fmt" type ( myInterface interface { f() } myType struct{} ) func (m *myType) f() {} func f() myInterface { var v *myType return v } func main() { v := f() if v == nil { fmt.Println("v is nil") } fmt.Printf("v value is: %v\n", v) } >> go run ./main.go v value is: <nil> typed nilの例
UnaryFunc(func(ctx context.Context, request AnyRequest) (AnyResponse, error) { if err := ctx.Err(); err != nil { return nil, err } typed, ok := request.(*Request[Req]) if !ok { return nil, errorf(CodeInternal, "unexpected handler request type %T", request) } res, err := unary(ctx, typed) if res == nil && err == nil { // This is going to panic during serialization. Debugging is much easier // if we panic here instead, so we can include the procedure name. panic(procedure + " returned nil *connect.Response and nil error") //nolint: forbidigo } return res, err })
UnaryFunc(func(ctx context.Context, request AnyRequest) (AnyResponse, error) { if err := ctx.Err(); err != nil { return nil, err } typed, ok := request.(*Request[Req]) if !ok { return nil, errorf(CodeInternal, "unexpected handler request type %T", request) } res, err := unary(ctx, typed) <- ここでtyped nilが返ってくることがあり if res == nil && err == nil { // This is going to panic during serialization. Debugging is much easier // if we panic here instead, so we can include the procedure name. panic(procedure + " returned nil *connect.Response and nil error") //nolint: forbidigo } return res, err <-ここで戻り値をそのまま返すので typed nilを返すことがある })
UnaryFunc(func(ctx context.Context, request AnyRequest) (AnyResponse, error) { if err := ctx.Err(); err != nil { return nil, err } typed, ok := request.(*Request[Req]) if !ok { return nil, errorf(CodeInternal, "unexpected handler request type %T", request) } res, err := unary(ctx, typed) if res == nil && err == nil { // This is going to panic during serialization. Debugging is much easier // if we panic here instead, so we can include the procedure name. panic(procedure + " returned nil *connect.Response and nil error") //nolint: forbidigo } if err != nil { return nil, err } return res, nil })
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