go/printer: use append

R=rsc
CC=golang-dev
https://golang.org/cl/2793041

diff --git a/src/pkg/go/printer/nodes.go b/src/pkg/go/printer/nodes.go
index 79e00bb8509c0c44cb47c1ce2bc575df2a21fc31..5c3c196b1b5cc56af2789be276004ca8533a8c46 100644 (file)
--- a/src/pkg/go/printer/nodes.go
+++ b/src/pkg/go/printer/nodes.go
@@ -10,7 +10,6 @@ package printer
 
 import (
        "bytes"
-       "container/vector"
        "go/ast"
        "go/token"
 )
@@ -718,23 +717,20 @@ func splitSelector(expr ast.Expr) (body, suffix ast.Expr) {
 
 // Convert an expression into an expression list split at the periods of
 // selector expressions.
-func selectorExprList(expr ast.Expr) []ast.Expr {
+func selectorExprList(expr ast.Expr) (list []ast.Expr) {
        // split expression
-       var list vector.Vector
        for expr != nil {
                var suffix ast.Expr
                expr, suffix = splitSelector(expr)
-               list.Push(suffix)
+               list = append(list, suffix)
        }
 
-       // convert expression list
-       result := make([]ast.Expr, len(list))
-       i := len(result)
-       for _, x := range list {
-               i--
-               result[i] = x.(ast.Expr)
+       // reverse list
+       for i, j := 0, len(list)-1; i < j; i, j = i+1, j-1 {
+               list[i], list[j] = list[j], list[i]
        }
-       return result
+
+       return
 }