d: remove unnecessary methods from the Lexer interface

The complete symbol approach in yylex removes the need for the methods
semanticVal, startPos and endPos, which were used when the values were
reported separately.

* data/skeletons/lalr1.d: Here.
* doc/bison.texi: Remove sections about the three methods.
* examples/d/calc/calc.y, examples/d/simple/calc.y: Remove the unused methods.
* tests/calc.at, tests/d.at, tests/scanner.at: Test it.

data/skeletons/lalr1.d

@@ -53,23 +53,7 @@ import std.format;
  * parser <tt>]b4_parser_class[</tt>.
  */
 public interface Lexer
-{]b4_locations_if([[
-  /**
-   * Method to retrieve the beginning position of the last scanned token.
-   * @@return the position at which the last scanned token starts.  */
-  Position startPos ();
-
-  /**
-   * Method to retrieve the ending position of the last scanned token.
-   * @@return the first position beyond the last scanned token.  */
-  Position endPos ();
-
-]])[
-  /**
-   * Method to retrieve the semantic value of the last scanned token.
-   * @@return the semantic value of the last scanned token.  */
-  Value semanticVal ();
-
+{
   /**
    * Entry point for the scanner.  Returns the token identifier corresponding
    * to the next token and prepares to return the semantic value

doc/bison.texi

@@ -14016,16 +14016,6 @@ Return the next token. The return value is of type @code{Symbol}, which
 binds together the kind, the semantic value and the location.
 @end deftypemethod
 
-@deftypemethod {Lexer} {Position} getStartPos()
-@deftypemethodx {Lexer} {Position} getEndPos()
-Return respectively the first position of the last token that @code{yylex}
-returned, and the first position beyond it.  These methods are not needed
-unless location tracking is active.
-
-They should return new objects for each call, to avoid that all the symbol
-share the same Position boundaries.
-@end deftypemethod
-
 @deftypemethod {Lexer} {void} reportSyntaxError(@code{YYParser.Context} @var{ctx})
 If you invoke @samp{%define parse.error custom} (@pxref{Bison
 Declarations}), then the parser no longer passes syntax error messages to

examples/d/calc/calc.y

@@ -108,11 +108,6 @@ if (isInputRange!R && is(ElementType!R : dchar))
 
   Value semanticVal_;
 
-  public final Value semanticVal()
-  {
-    return semanticVal_;
-  }
-
   Symbol yylex()
   {
     import std.uni : isWhite, isNumber;
@@ -167,16 +162,6 @@ if (isInputRange!R && is(ElementType!R : dchar))
       default: assert(0);
     }
   }
-
-  Position startPos() const
-  {
-    return location.begin;
-  }
-
-  Position endPos() const
-  {
-    return location.end;
-  }
 }
 
 int main()

examples/d/simple/calc.y

@@ -102,13 +102,6 @@ if (isInputRange!R && is(ElementType!R : dchar))
     stderr.writeln(s);
   }
 
-  Value semanticVal_;
-
-  public final Value semanticVal()
-  {
-    return semanticVal_;
-  }
-
   Symbol yylex()
   {
     import std.uni : isWhite, isNumber;

tests/calc.at

@@ -565,22 +565,7 @@ class CalcLexer(R) : Lexer
 
   Value semanticVal_;]AT_LOCATION_IF([[
   Location location;
-
-  public final @property Position startPos()
-  {
-    return location.begin;
-  }
-
-  public final @property Position endPos()
-  {
-    return location.end;
-  }
 ]])[
-  public final @property Value semanticVal()
-  {
-    return semanticVal_;
-  }
-
   int parseInt ()
   {
     auto res = 0;

tests/d.at

@@ -79,7 +79,6 @@ class CalcLexer(R) : Lexer
   void yyerror(string s) {}
 
   Value semanticVal_;
-  Value semanticVal() @property { return semanticVal_; }
 
   Symbol yylex()
   {

tests/scanner.at

@@ -116,10 +116,6 @@ class YYLexer(R) : Lexer
   ]AT_YYERROR_DEFINE[
 
   Value semanticVal_;
-  public final @property Value semanticVal ()
-  {
-    return semanticVal_;
-  }
 
   Symbol yylex ()
   {