Fix a few errors

autoload/features/outline.vim

@@ -180,7 +180,7 @@ function! s:RenderOutline()
     exec ":" . len(rlines)
     normal! dG
 
-    if !wasFocused && g:nvim_nim_outline_track_symbol && closest != 0
+    if !wasFocused && g:nvim_nim_outline_track_symbol && closest != 0 && has_key(s:buffermap, closest)
         call cursor(s:buffermap[closest], 2)
         normal zz
         normal ^

autoload/highlighter.vim

@@ -1,10 +1,9 @@
 scriptencoding utf-8
 
 
-if exists("s:loaded")
-    finish
-endif
-let s:loaded = 1
+let s:save_cpo = &cpo
+set cpo&vim
+
 
 let s:all_highlights = {
             \ 'skProc':         "Function",
@@ -51,13 +50,20 @@ endfunction
 function! s:NimHighlighter.on_stderr(job, chunk)
 endfunction
 
+function! Remove(id)
+    try
+        call matchdelete(a:id)
+    catch /E803:/
+    endtry
+endfunction
+
 function! s:NimHighlighter.on_exit()
     if empty(self.lines) && self.file != expand("%:p")
         return
     endif
 
     for m in b:highlights
-        call matchdelete(m)
+        call Remove(m)
     endfor
 
     let b:highlights = []
@@ -130,3 +136,7 @@ function! highlighter#guard()
         endif
     endif
 endfunction
+
+
+let &cpo = s:save_cpo
+unlet s:save_cpo

autoload/modules.vim

@@ -1,10 +1,8 @@
 scriptencoding utf-8
 
 
-if exists("s:loaded")
-    finish
-endif
-let s:loaded = 1
+let s:save_cpo = &cpo
+set cpo&vim
 
 
 function! modules#FindImportLocation()
@@ -83,3 +81,7 @@ endfunction
 function! modules#FindGlobalImports()
     return modules#ImportMap(globpath(g:nvim_nim_deps_nim, "**/*.nim", 0, 1))
 endfunction
+
+
+let &cpo = s:save_cpo
+unlet s:save_cpo

autoload/omni.vim

@@ -1,10 +1,9 @@
 scriptencoding utf-8
 
 
-if exists("s:loaded")
-    finish
-endif
-let s:loaded = 1
+let s:save_cpo = &cpo
+set cpo&vim
+
 
 function! omni#item(parsed)
     return {
@@ -70,3 +69,7 @@ function! omni#nim(findstart, base)
                 \ 'words': completions,
                 \ 'refresh': 'always' }
 endfunction
+
+
+let &cpo = s:save_cpo
+unlet s:save_cpo

autoload/util.vim

@@ -1,10 +1,7 @@
 scriptencoding utf-8
 
-
-if exists("s:loaded")
-    finish
-endif
-let s:loaded = 1
+let s:save_cpo = &cpo
+set cpo&vim
 
 
 let s:idtypes = {
@@ -298,3 +295,7 @@ function! NimReplSend(motion_wiseness)
     echom str
     call features#repl#send(str)
 endfunction
+
+
+let &cpo = s:save_cpo
+unlet s:save_cpo

plugin/nim.vim

@@ -59,7 +59,8 @@ let g:nvim_nim_enable_custom_textobjects = 1
 
 let g:nvim_nim_highlighter_enable        = 1
 let g:nvim_nim_highlight_builtin         = 1
-let g:nvim_nim_highlighter_semantics     = ["skConst", "skForVar", "skGlobalVar", "skGlobalLet", "skLet", "skModule", "skParam", "skTemp", "skVar"]
+" let g:nvim_nim_highlighter_semantics     = ["skConst", "skForVar", "skGlobalVar", "skGlobalLet", "skLet", "skModule", "skParam", "skTemp", "skVar"]
+let g:nvim_nim_highlighter_semantics     = []
 
 call highlighter#select_highlights(["skProc", "skTemplate", "skType", "skMacro", "skMethod", "skField", "skForVar", "skIterator"])