remove some unneeded code in Peek/Not (#401)

Author: johnynek

core/shared/src/main/scala/cats/parse/Parser.scala

@@ -1624,12 +1624,12 @@ object Parser {
     * strings, for instance.
     */
   def until0(p: Parser0[Any]): Parser0[String] =
-    (not(p).with1 ~ anyChar).rep0.string
+    repUntil0(anyChar, p).string
 
   /** parse one or more characters as long as they don't match p
     */
   def until(p: Parser0[Any]): Parser[String] =
-    (not(p).with1 ~ anyChar).rep.string
+    repUntil(anyChar, p).string
 
   /** parse zero or more times until Parser `end` succeeds.
     */
@@ -3270,12 +3270,10 @@ object Parser {
      * else fail
      */
     case class Not(under: Parser0[Unit]) extends Parser0[Unit] {
+      // under is the result of a void, so we don't need to void here
       override def parseMut(state: State): Unit = {
         val offset = state.offset
-        val cap = state.capture
-        state.capture = false
         under.parseMut(state)
-        state.capture = cap
         if (state.error ne null) {
           // under failed, so we succeed
           state.error = null
@@ -3304,12 +3302,10 @@ object Parser {
      * not advance
      */
     case class Peek(under: Parser0[Unit]) extends Parser0[Unit] {
+      // note: under is already voided, so we don't need to adjust capture
       override def parseMut(state: State): Unit = {
         val offset = state.offset
-        val cap = state.capture
-        state.capture = false
         under.parseMut(state)
-        state.capture = cap
         if (state.error eq null) {
           // under passed, so we succeed
           state.offset = offset