vimrc: some racket things

vim/vimrc

@@ -243,11 +243,15 @@ au BufNewFile,BufRead *.s,*.inc setlocal shiftwidth=8 filetype=asm_ca65
 " close empty buffers automatically
 au BufEnter * call s:CloseEmptyBuffers()
 
-" EDF → conf
-au FileType edif set syntax=conf
+" .rkt → Racket
+au BufRead,BufNewFile *.rkt set syntax=racket
+
+" .edf → conf
+au BufRead,BufNewFile *.edf set syntax=conf
 
 " disable most ftplugins
 au BufReadPre * let b:did_ftplugin=1
+au BufReadPre *.rkt unlet b:did_ftplugin
 
 " enable tagbar
 "au VimEnter * nested :TagbarOpen
@@ -382,6 +386,9 @@ nm cr <Plug>(abolish-coerce-word)
 nn KK :Gr \b<C-r><C-w>\b<CR>
 nn Kk :Gr<Space>
 
+" quick lambda
+nn <Leader>l iλ<Esc>
+
 " Rainbow Config -------------------------------------------------------------|
 
 let g:rainbow_conf = {