suggest: quote operators and keywords on suggestion (#10460)

compiler/suggest.nim

@@ -33,7 +33,7 @@
 # included from sigmatch.nim
 
 import algorithm, prefixmatches, lineinfos, pathutils
-from wordrecg import wDeprecated, wError
+from wordrecg import wDeprecated, wError, wAddr, wYield, specialWords
 
 when defined(nimsuggest):
   import passes, tables # importer
@@ -109,6 +109,10 @@ proc symToSuggest(conf: ConfigRef; s: PSym, isLocal: bool, section: IdeCmd, info
         result.qualifiedPath.add(ow2.origModuleName)
       if ow != nil:
         result.qualifiedPath.add(ow.origModuleName)
+    if s.name.s[0] in OpChars + {'[', '{', '('} or
+       s.name.id in ord(wAddr)..ord(wYield):
+      result.qualifiedPath.add('`' & s.name.s & '`')
+    else:
       result.qualifiedPath.add(s.name.s)
 
     if s.typ != nil:

nimsuggest/tests/tsug_accquote.nim

@@ -0,0 +1,10 @@
+proc `%%%`(a: int) = discard
+proc `cast`() = discard
+tsug_accquote.#[!]#
+
+discard """
+$nimsuggest --tester $file
+>sug $1
+sug;;skProc;;tsug_accquote.`%%%`;;proc (a: int);;$file;;1;;5;;"";;100;;None
+sug;;skProc;;tsug_accquote.`cast`;;proc ();;$file;;2;;5;;"";;100;;None
+"""