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When using lookahead correction, the method YYParser.Context.getExpectedTokens is not annotated with const, because the method calls yylacCheck, which is not const. Also, because of yylacStack and yylacEstablished, yylacCheck needs to be called from the context of the parser class, which is sent as parameter to the Context's constructor. * data/skeletons/lalr1.d (yylacCheck, yylacEstablish, yylacDiscard, yylacStack, yylacEstablished): New. (Context): Use it. * doc/bison.texi: Document it. * tests/calc.at: Check it.