edd5e97045
This is a hard coded extra case. It is not an instance of has_coe. Even if we change has_coe to accomodate this case, it will not be a satisfactory solution because this coercion depends on the element and not the type, and the element usually contains metavariables. We should eventually write a tactic for synthesizing coercions.
52 lines
1.5 KiB
Text
52 lines
1.5 KiB
Text
/-
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Copyright (c) 2016 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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prelude
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import init.logic init.data.to_string init.meta.format
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import init.meta.contradiction_tactic init.meta.constructor_tactic
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import init.meta.relation_tactics init.meta.injection_tactic
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/- We can specify the scope of application of some tactics using
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the following type.
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- all : all occurrences of a given term are considered.
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- pos [1, 3] : only the first and third occurrences of a given
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term are consiered.
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- neg [2] : all but the second occurrence of a given term
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are considered. -/
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inductive occurrences
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| all
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| pos : list nat → occurrences
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| neg : list nat → occurrences
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open occurrences
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def occurrences.contains : occurrences → nat → bool
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| all p := tt
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| (occurrences.pos ps) p := p ∈ ps
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| (occurrences.neg ps) p := p ∉ ps
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instance : inhabited occurrences :=
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⟨all⟩
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def occurrences_to_string : occurrences → string
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| occurrences.all := "*"
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| (occurrences.pos l) := to_string l
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| (occurrences.neg l) := "-" ++ to_string l
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instance : has_to_string occurrences :=
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⟨occurrences_to_string⟩
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meta def occurrences_to_format : occurrences → format
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| occurrences.all := to_fmt "*"
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| (occurrences.pos l) := to_fmt l
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| (occurrences.neg l) := to_fmt "-" ++ to_fmt l
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meta instance : has_to_format occurrences :=
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⟨occurrences_to_format⟩
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open decidable tactic
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