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Admin/BUGS

author | wenzelm |

Thu, 15 Nov 2001 18:20:13 +0100 | |

changeset 12207 | 4dff931b852f |

parent 10991 | 2e59c831cf07 |

child 13447 | 3470596f3cd5 |

permissions | -rw-r--r-- |

added Induct/Binary_Trees.thy, Induct/Tree_Forest (converted from
former ex/TF.ML ex/TF.thy ex/Term.ML ex/Term.thy);

Isabelle BUGS -- history of reported faults =========================================== 1. Symptom: hyp_subst_tac does nothing if the selected equality involves type unknowns. Cause: it uses the simplifier, which ignores such equalities. Fix: check for type unknowns in hypsubst/inspect_pair; change interface function dest_eq to return the type of the equality. (lcp, 5/11/97) 2. Symptom: read_instantiate_sg has problems instantiating types in some simultaneous instantiations (Message-id: <199710301432.PAA20594@sirius.Informatik.Uni-Bremen.DE> on isabelle-users) - res_inst_tac bug: val [p1, p2] = Goalw [o_def] "[| f : Funs (range g); !!h. f = g o h ==> P |] ==> P"; by (res_inst_tac [("h", "%x. @y. f x = g y")] p2 1); by (res_inst_tac [("h", "%x. @y. (f x::'b) = g y")] p2 1); ^^^^ required! Problem: lift_inst_rule only refers to syntactic context of current dynamic proof state; old-style goal initially does not contain hyps (!!); Fix: either make assumptions statically scoped (included as hyps in goal), or pass additional environment to lift_inst_rule (this would improve upon Isar's res_inst_tac as well); - type infer / inst bug: Goal "x = (x::?'a)"; by (cut_inst_tac [("t", "x")] refl 1); - bug in prove_goal (!?): forall_elim: Variable ?uu has two distinct types 'a 'b *** The exception above was raised for *** (!!uu uua. PROP P (uu, uua)) ==> PROP P xa