Finalize the new approach to reading chars in the reader

docs/examples/hello_world.srn

@@ -1,10 +1,9 @@
 (def main
-  (fn () 3))
+  (fn () 4))
 
 (def main1 (fn (v y n) 3))
 ht
 
 
-3d
 
 (- 3 4 (sh - r e 3bea -32) ((((())))))

include/serene/reader/reader.h

@@ -69,7 +69,6 @@ private:
   Location currentLocation;
 
   bool readEOL = false;
-  bool startedReading = false;
 
   /// Returns a clone of the current location
   Location getCurrentLocation();

src/serene/reader/reader.cpp

@@ -56,7 +56,7 @@ Reader::Reader(SereneContext &ctx, llvm::StringRef buffer, llvm::StringRef ns,
     : ctx(ctx), ns(ns), filename(filename), buf(buffer),
       currentLocation(Location(ns, filename)) {
   READER_LOG("Setting the first char of the buffer");
-  currentChar          = buf.begin();
+  currentChar          = buf.begin() - 1;
   currentPos           = 1;
   currentLocation.line = 1;
   currentLocation.col  = 1;
@@ -94,8 +94,6 @@ void Reader::advanceByOne() {
                                 << currentLocation.toString());
 };
 void Reader::advance(bool skipWhitespace) {
-  startedReading = true;
-
   if (skipWhitespace) {
     for (;;) {
       auto next = currentChar + 1;
@@ -112,10 +110,6 @@ void Reader::advance(bool skipWhitespace) {
 };
 
 const char *Reader::nextChar(bool skipWhitespace, unsigned count) {
-  if (!startedReading) {
-    return currentChar;
-  }
-
   if (!skipWhitespace) {
     READER_LOG("Next char: " << *(currentChar + count));
     return currentChar + count;