exp/eval: build fix for parser.ParseFile API change.
exp/eval: build fix for parser.ParseFile API change.

R=golang-dev, nigeltao
CC=golang-dev
http://codereview.appspot.com/3283042

Committer: Nigel Tao <58ae08b3356928ff9c67562b4719487d54fe8348@golang.org>

mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,d0f/go-zh,sanjosh/sanjos100-tipc,sanjosh/sanjos100-tipc,Triskite/willstone-goclone,npe9/noahevans-go9,glycerine/jeaten-go-arrayof-structof,d0f/go-zh,rdp/rogerpack2005-golang,npe9/noahevans-go9,bryanxu/go-zh,glycerine/jeaten-go-arrayof-structof,mhennings/marcohennings-go,bryanxu/go-zh,Triskite/willstone-goclone,rdp/rogerpack2005-golang,d0f/go-zh,webfd/go-zh,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,webfd/go-zh,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,mhennings/marcohennings-go,npe9/noahevans-go9,d0f/go-zh,mhennings/marcohennings-go,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,Triskite/willstone-goclone,scirelli/scirelli-go,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,sanjosh/sanjos100-tipc,d0f/go-zh,Triskite/willstone-goclone,scirelli/scirelli-go,bryanxu/go-zh,Triskite/willstone-goclone,bryanxu/go-zh,mhennings/marcohennings-go,webfd/go-zh,npe9/noahevans-go9,sanjosh/sanjos100-tipc,scirelli/scirelli-go,scirelli/scirelli-go,scirelli/scirelli-go,scirelli/scirelli-go,npe9/noahevans-go9,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,scirelli/scirelli-go,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,bryanxu/go-zh,bryanxu/go-zh,npe9/noahevans-go9,mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,npe9/noahevans-go9,rflanagan/reginaldflanagan-project1,rdp/rogerpack2005-golang,rdp/rogerpack2005-golang,rdp/rogerpack2005-golang,rdp/rogerpack2005-golang,webfd/go-zh,sanjosh/sanjos100-tipc,rflanagan/reginaldflanagan-project1,d0f/go-zh,bryanxu/go-zh,d0f/go-zh,mhennings/marcohennings-go,glycerine/jeaten-go-arrayof-structof,d0f/go-zh,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,rflanagan/reginaldflanagan-project1,rflanagan/reginaldflanagan-project1,rdp/rogerpack2005-golang,webfd/go-zh,webfd/go-zh,bryanxu/go-zh,npe9/noahevans-go9,sanjosh/sanjos100-tipc,webfd/go-zh,rflanagan/reginaldflanagan-project1