code review 2763041: use copy

src/pkg/exp/eval/func.go

Index: src/pkg/exp/eval/func.go
===================================================================
--- a/src/pkg/exp/eval/func.go
+++ b/src/pkg/exp/eval/func.go
@@ -46,9 +46,7 @@
 	n := len(b.instrs)
 	if n >= cap(b.instrs) {
 		a := make(code, n, n*2)
-		for i := range b.instrs {
-			a[i] = b.instrs[i]
-		}
+		copy(a, b.instrs)
 		b.instrs = a
 	}
 	b.instrs = b.instrs[0 : n+1]
@@ -60,9 +58,7 @@
 func (b *codeBuf) get() code {
 	// Freeze this buffer into an array of exactly the right size
 	a := make(code, len(b.instrs))
-	for i := range b.instrs {
-		a[i] = b.instrs[i]
-	}
+	copy(a, b.instrs)
 	return code(a)
 }