doc-src/Tutorial/Misc/InfixTree.ML

cleaned comments;
ThyInfo.finalize_all renamed to ThyInfo.finish;
added remove_thy;

Goal "!xs. linInfixList t xs = infixList t @ xs";
by(induct_tac "t" 1);
by(Simp_tac 1);
by(Asm_simp_tac 1);