vim cannot indent awk correctly

The following is the indented results of an awk file.

~/linux/test/awk/lang/operator/[$ cat main.awk
BEGIN {
}

{
}

END {
}

I have the following vim installed (from MacVim). Is there a problem
with vim? Or there is some problem with my installation?

~/linux/test/awk/lang/operator/[$ gvim --version
VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Sep 1 2012 18:08:47)
MacOS X (unix) version
Included patches: 1-646
Compiled by Bjorn Winckler <bjorn.winckler@gmail.com>
Huge version with MacVim GUI. Features included (+) or not (-):
+arabic +autocmd +balloon_eval +browse ++builtin_terms +byte_offset
+cindent
+clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info
+comments
+conceal +cryptv +cscope +cursorbind +cursorshape +dialog_con_gui
+diff
+digraphs +dnd -ebcdic +emacs_tags +eval +ex_extra +extra_search
+farsi
+file_in_path +find_in_path +float +folding -footer +fork()
+fullscreen
-gettext -hangul_input +iconv +insert_expand +jumplist +keymap
+langmap
+libcall +linebreak +lispindent +listcmds +localmap -lua +menu
+mksession
+modify_fname +mouse +mouseshape +mouse_dec -mouse_gpm -mouse_jsbterm
+mouse_netterm -mouse_sysmouse +mouse_xterm +mouse_urxvt +mouse_sgr
+multi_byte
+multi_lang -mzscheme +netbeans_intg +odbeditor +path_extra +perl
+persistent_undo +postscript +printer +profile +python -python3
+quickfix
+reltime +rightleft +ruby +scrollbind +signs +smartindent -sniff
+startuptime
+statusline -sun_workshop +syntax +tag_binary +tag_old_static -
tag_any_white
-tcl +terminfo +termresponse +textobjects +title +toolbar
+transparency
+user_commands +vertsplit +virtualedit +visual +visualextra +viminfo
+vreplace
+wildignore +wildmenu +windows +writebackup -X11 -xfontset +xim -xsmp
-xterm_clipboard -xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/Applications/MacVim.app/Contents/Resources/
vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -
Wall -Wno-unknown-pragmas -pipe -DMACOS_X_UNIX -no-cpp-precomp -g -
O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang -L. -L. -L/usr/local/lib -o Vim -framework
Cocoa -framework Carbon -lncurses -liconv -framework Cocoa -
fstack-protector -L/usr/local/lib -L/System/Library/Perl/5.12/darwin-
thread-multi-2level/CORE -lperl -lm -lutil -lc -framework Python -
framework Ruby

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