code review 157082: Permit omission of hi bound in slices.

src/pkg/exp/eval/expr.go

 // Copyright 2009 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package eval
 
 import (
         "bignum";
         "go/ast";
         "go/token";
@@ skipping 573 matching lines @@
                 l, r := a.compile(x.X, false), a.compile(x.Index, false);
                 if l == nil || r == nil {
                         return nil
                 }
                 return ei.compileIndexExpr(l, r);
 
         case *ast.SliceExpr:
                 end := x.End;
                 if end == nil {
                         // TODO: set end to len(x.X)
-                        panic("unimplemented");
+                        panic("unimplemented")
                 }
                 arr := a.compile(x.X, false);
                 lo := a.compile(x.Index, false);
                 hi := a.compile(end, false);
                 if arr == nil || lo == nil || hi == nil {
                         return nil
                 }
                 return ei.compileSliceExpr(arr, lo, hi);
 
         case *ast.KeyValueExpr:
@@ skipping 1372 matching lines @@
         if a.evalAddr == nil {
                 return effect, getTemp
         }
 
         deref := a.compileStarExpr(getTemp);
         if deref == nil {
                 return nil, nil
         }
         return effect, deref;
 }