code review 1211047: bignum: deprecate by moving into exp directory

src/pkg/exp/eval/expr1.go

 // This file is machine generated by gen.go.
 // 6g gen.go && 6l gen.6 && ./6.out >expr1.go
 
 package eval
 
 import (
-        "bignum"
+        "exp/bignum"
         "log"
 )
 
 /*
  * "As" functions.  These retrieve evaluator functions from an
  * expr, panicking if the requested evaluator has the wrong type.
  */
 func (a *expr) asBool() func(*Thread) bool {
         return a.eval.(func(*Thread) bool)
 }
@@ skipping 1878 matching lines @@
                 rf := r.asSlice()
                 return func(lv Value, t *Thread) { lv.(SliceValue).Set(t, rf(t)) }
         case *MapType:
                 rf := r.asMap()
                 return func(lv Value, t *Thread) { lv.(MapValue).Set(t, rf(t)) }
         default:
                 log.Crashf("unexpected left operand type %v at %v", lt, r.pos)
         }
         panic("fail")
 }