Do what the user means for b:dispatch = '-compiler=x'

References: #315

Author: tpope

autoload/dispatch.vim

@@ -815,7 +815,6 @@ function! dispatch#compile_command(bang, args, count, ...) abort
   let [args, request] = s:extract_opts(a:args)
 
   if empty(args)
-    let args = '--'
     let default_dispatch = 1
     if type(get(b:, 'dispatch')) == type('')
       unlet! default_dispatch
@@ -829,6 +828,9 @@ function! dispatch#compile_command(bang, args, count, ...) abort
     endfor
     let [args, request] = s:extract_opts(args, request)
   endif
+  if empty(args)
+    let args = '--'
+  endif
 
   if args =~# '^!'
     return 'Start' . (a:bang ? '!' : '') . ' ' . args[1:-1]