remove some unused code (#2116)

* remove unused code

Author: nonbutAworker

binder_test.go

@@ -54,7 +54,7 @@ func TestBindingError_Error(t *testing.T) {
 func TestBindingError_ErrorJSON(t *testing.T) {
 	err := NewBindingError("id", []string{"1", "nope"}, "bind failed", errors.New("internal error"))
 
-	resp, err := json.Marshal(err)
+	resp, _ := json.Marshal(err)
 
 	assert.Equal(t, `{"field":"id","message":"bind failed"}`, string(resp))
 }

router_test.go

@@ -1,7 +1,6 @@
 package echo
 
 import (
-	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -2446,33 +2445,3 @@ func BenchmarkRouterGooglePlusAPIMisses(b *testing.B) {
 func BenchmarkRouterParamsAndAnyAPI(b *testing.B) {
 	benchmarkRouterRoutes(b, paramAndAnyAPI, paramAndAnyAPIToFind)
 }
-
-func (n *node) printTree(pfx string, tail bool) {
-	p := prefix(tail, pfx, "└── ", "├── ")
-	fmt.Printf("%s%s, %p: type=%d, parent=%p, handler=%v, pnames=%v\n", p, n.prefix, n, n.kind, n.parent, n.methodHandler, n.pnames)
-
-	p = prefix(tail, pfx, "    ", "│   ")
-
-	children := n.staticChildren
-	l := len(children)
-
-	if n.paramChild != nil {
-		n.paramChild.printTree(p, n.anyChild == nil && l == 0)
-	}
-	if n.anyChild != nil {
-		n.anyChild.printTree(p, l == 0)
-	}
-	for i := 0; i < l-1; i++ {
-		children[i].printTree(p, false)
-	}
-	if l > 0 {
-		children[l-1].printTree(p, true)
-	}
-}
-
-func prefix(tail bool, p, on, off string) string {
-	if tail {
-		return fmt.Sprintf("%s%s", p, on)
-	}
-	return fmt.Sprintf("%s%s", p, off)
-}