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(the action is "clear").
Added subst_intropattern which was missing since the introduction of
ApplyOn intro patterns.
Still to do: make "intros _ ?id" working without interferences when
"id" is precisely the internal name used for hypotheses to discard.
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"pat/term" for "apply term on current_hyp as pat".
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- emphasizing the different kinds of patterns
- factorizing code of the non-naming intro-patterns
Still some questions:
- Should -> and <- apply to hypotheses or not (currently they apply to
hypotheses either when used in assert-style tactics or apply in, or
when the term to rewrite is a variable, in which case "subst" is
applied)?
- Should "subst" be used when the -> or <- rewrites an equation x=t
posed by "assert" (i.e. rewrite everywhere and clearing x and hyp)?
- Should -> and <- be applicable in non assert-style if the lemma has
quantifications?
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NB: new file miscprint.ml deserves to be part of printing.cma,
but should be part of proofs.cma for the moment, due to use in logic.ml
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