More readable but not perfect parser token pprint

src/parser/parser_types.nim

@@ -330,10 +330,14 @@ proc foldBuilder*[T, T2](
 
 # -- Stringifiers
 
-proc `$`*(x: ParserToken): string =
-  &"""ParserToken(
-  value: {tokenStringValue(x)},
-)"""
+func pprint*(x: ParserToken): string =
+  let str = tokenStringValue(x)
+  let escapedChar = if str == "\n": "\\n"
+                    else: str
+  &"""ParserToken("{escapedChar}")
+"""
+
+func `$`*(x: ParserToken): string = pprint(x)
 
 const LEFT_HIGHLIGHT_CHAR = ">>"
 const RIGHT_HIGHLIGHT_CHAR = "<<"