Rename to match rest

src_v2/parser/parser_internals.nim

@@ -106,10 +106,10 @@ proc str*(expectedString: string): parserFnT {.inline.} =
   ## Creates parser function with `expectedString`
   ## When the parser has the string at the following index return `ParserResult.ok`
   return proc(parser: Parser): ParserResult =
-    var p = parser.ok()
+    var res = parser.ok()
     for c in expectedString.items:
-      p = p.flatMap(ch(c))
-    return p
+      res = res.flatMap(ch(c))
+    return res
 
 # -- Parsing API