# Documentation

Lean.Parser.Command

Syntax quotation for terms.

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Syntax quotation for (sequences of) commands. The identical syntax for term quotations takes priority, so ambiguous quotations like ($x$y) will be parsed as an application, not two commands. Use ($x:command$y:command) instead. Multiple commands will be put in a null node, but a single command will not (so that you can directly match against a quotation in a command kind's elaborator).

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In Lean, every concrete type other than the universes and every type constructor other than dependent arrows is an instance of a general family of type constructions known as inductive types. It is remarkable that it is possible to construct a substantial edifice of mathematics based on nothing more than the type universes, dependent arrow types, and inductive types; everything else follows from those. Intuitively, an inductive type is built up from a specified list of constructor. For example, List α is the list of elements of type α, and is defined as follows:

inductive List (α : Type u) where
| nil
| cons (head : α) (tail : List α)


A list of elements of type α is either the empty list, nil, or an element head : α followed by a list tail : List α. For more information about inductive types.

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This is an auxiliary command for generation constructor injectivity theorems for inductive types defined at Prelude.lean. It is meant for bootstrapping purposes only.

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No-op parser used as syntax kind for attaching remaining whitespace to at the end of the input.

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open Foo in e is like open Foo but scoped to a single term. It makes the given namespaces available in the term e.

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set_option opt val in e is like set_option opt val but scoped to a single term. It sets the option opt to the value val in the term e.

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open Foo in tacs (the tactic) acts like open Foo at command level, but it opens a namespace only within the tactics tacs.

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set_option opt val in tacs (the tactic) acts like set_option opt val at the command level, but it sets the option only within the tactics tacs`.

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