[BUG] hg copy accepting paths that are broken

[Daniel Santa Cruz]

Running hg from tip under windows:

c:\src>hg.bat copy a/oldFolder\c.txt a/newFolder\c.txt

These 2 paths are obviously wrong, but hg will not complain about
them.  After the previous command is executed, hg will enter into an
error state.

c:>src>hg status

returns 2 entries for the new file, one under [R] and the other one
under [?], and none under [A], which should be the correct state of
that file.

Daniel.