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Parser.Context class returns a const YYLocation, so Lexer's method yyerror() needs to receive the location as a const parameter. Internal error reporting flow is changed to be similar to that of the other skeletons. Before, case YYERRLAB was calling yyerror() with the result of yysyntax_error() as the string parameter. As the custom error message lets the user decide if they want to use yyerror() or not, this flow needed to be changed. Now, case YYERRLAB calls yyreportSyntaxError(), that builds the error message using yysyntaxErrorArguments(). Then yyreportSyntaxError() passes the error message to the user defined syntax_error() in case of a custom message, or to yyerror() otherwise. In the tests in tests/calc.at, the order of the tokens needs to be changed in order of precedence, so that the D program outputs the expected tokens in the same order as the other parsers. * data/skeletons/lalr1.d: Add the custom error message feature. * doc/bison.texi: Document it. * examples/d/calc/calc.y: Adjust. * tests/calc.at, tests/local.at: Test it.