Add $# to list of variables not containing spaces (fixes #1362)

src/ShellCheck/Analytics.hs

@@ -1601,6 +1601,7 @@ prop_checkSpacefulness32= verifyNotTree checkSpacefulness "var=$1; [ -v var ]"
 prop_checkSpacefulness33= verifyTree checkSpacefulness "for file; do echo $file; done"
 prop_checkSpacefulness34= verifyTree checkSpacefulness "declare foo$n=$1"
 prop_checkSpacefulness35= verifyNotTree checkSpacefulness "echo ${1+\"$1\"}"
+prop_checkSpacefulness36= verifyNotTree checkSpacefulness "arg=$#; echo $arg"
 
 checkSpacefulness params t =
     doVariableFlowAnalysis readF writeF (Map.fromList defaults) (variableFlow params)

src/ShellCheck/Data.hs

@@ -39,7 +39,7 @@ internalVariables = [
   ]
 
 variablesWithoutSpaces = [
-    "$", "-", "?", "!",
+    "$", "-", "?", "!", "#",
     "BASHPID", "BASH_ARGC", "BASH_LINENO", "BASH_SUBSHELL", "EUID", "LINENO",
     "OPTIND", "PPID", "RANDOM", "SECONDS", "SHELLOPTS", "SHLVL", "UID",
     "COLUMNS", "HISTFILESIZE", "HISTSIZE", "LINES"