# Documentation

Lean.Elab.Quotation

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Transform sequence of pushes and appends into acceptable code

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# match #

• match step that always succeeds: _, x, ($x), ... unconditional: Lean.Elab.Term.Quotation.HeadCheck • match step based on kind and, optionally, arity of discriminant If arity is given, that number of new discriminants is introduced. covered patterns should then introduce the same number of new patterns. We actually check the arity at run time only in the case of null nodes since it should otherwise by implied by the node kind. without arity: ($x:k) with arity: any quotation without an antiquotation head pattern

shape:
• Match step that succeeds on null nodes of arity at least numPrefix + numSuffix, introducing discriminants for the first numPrefix children, one null node for those in between, and for the numSuffix last children. example: ([$x,$xs,*, $y]) is slice 2 2 slice: • other, complicated match step that will probably only cover identical patterns example: antiquotation splices ($[...]*)

other:

In a single match step, we match the first discriminant against the "head" of the first pattern of the first alternative. This datatype describes what kind of check this involves, which helps other patterns decide if they are covered by the same check and don't have to be checked again (see also MatchResult).

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• Pattern agrees with head check, remove and transform remaining alternative. If exhaustive is false, also include unchanged alternative in the "no" branch.

covered:
• Pattern disagrees with head check, include in "no" branch only

uncovered: Lean.Elab.Term.Quotation.MatchResult
• Pattern is not quite sure yet; include unchanged in both branches

undecided: Lean.Elab.Term.Quotation.MatchResult

Describe whether a pattern is covered by a head check (induced by the pattern itself or a different pattern).

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• check induced by the pattern

• compute compatibility of pattern with given head check

• actually run the specified head check, with the discriminant bound to __discr

All necessary information on a pattern head.

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