def Lean.Parser.Command.commentBody : Lean.Parser.Parser

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def Lean.Parser.Command.commentBody.parenthesizer : Lean.PrettyPrinter.Parenthesizer

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• Lean.Parser.Command.commentBody.parenthesizer = Lean.PrettyPrinter.Parenthesizer.visitToken

def Lean.Parser.Command.commentBody.formatter : Lean.PrettyPrinter.Formatter

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• Lean.Parser.Command.commentBody.formatter = Lean.PrettyPrinter.Formatter.visitAtom Lean.Name.anonymous

def Lean.Parser.Command.docComment : Lean.Parser.Parser

A docComment parses a "documentation comment" like /-- foo -/. This is not treated like a regular comment (that is, as whitespace); it is parsed and forms part of the syntax tree structure.

A docComment node contains a /-- atom and then the remainder of the comment, foo -/ in this example. Use TSyntax.getDocString to extract the body text from a doc string syntax node.

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@[inline]

def Lean.Parser.tacticParser (rbp : optParam Nat 0) : Lean.Parser.Parser

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• Lean.Parser.tacticParser rbp = Lean.Parser.categoryParser `tactic rbp

@[inline]

def Lean.Parser.convParser (rbp : optParam Nat 0) : Lean.Parser.Parser

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• Lean.Parser.convParser rbp = Lean.Parser.categoryParser `conv rbp

def Lean.Parser.Tactic.sepByIndentSemicolon (p : Lean.Parser.Parser) : Lean.Parser.Parser

sepByIndentSemicolon(p) parses a sequence of p optionally followed by ;, similar to manyIndent(p ";"?), except that if two occurrences of p occur on the same line, the ; is mandatory. This is used by tactic parsing, so that

example := by
  skip
  skip

is legal, but by skip skip is not - it must be written as by skip; skip.

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• Lean.Parser.Tactic.sepByIndentSemicolon p = Lean.Parser.sepByIndent p "; " (Lean.Parser.symbol "; ") true

def Lean.Parser.Tactic.sepBy1IndentSemicolon (p : Lean.Parser.Parser) : Lean.Parser.Parser

sepBy1IndentSemicolon(p) parses a (nonempty) sequence of p optionally followed by ;, similar to many1Indent(p ";"?), except that if two occurrences of p occur on the same line, the ; is mandatory. This is used by tactic parsing, so that

example := by
  skip
  skip

is legal, but by skip skip is not - it must be written as by skip; skip.

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• Lean.Parser.Tactic.sepBy1IndentSemicolon p = Lean.Parser.sepBy1Indent p "; " (Lean.Parser.symbol "; ") true

def Lean.Parser.Tactic.tacticSeq1Indented : Lean.Parser.Parser

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def Lean.Parser.Tactic.tacticSeqBracketed : Lean.Parser.Parser

The syntax { tacs } is an alternative syntax for · tacs. It runs the tactics in sequence, and fails if the goal is not solved.

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def Lean.Parser.Tactic.tacticSeq : Lean.Parser.Parser

A sequence of tactics in brackets, or a delimiter-free indented sequence of tactics. Delimiter-free indentation is determined by the first tactic of the sequence.

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def Lean.Parser.Tactic.tacticSeqIndentGt : Lean.Parser.Parser

Same as [tacticSeq] but requires delimiter-free tactic sequence to have strict indentation. The strict indentation requirement only apply to nested bys, as top-level bys do not have a position set.

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def Lean.Parser.Tactic.seq1 : Lean.Parser.Parser

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• Lean.Parser.Tactic.seq1 = Lean.Parser.node `Lean.Parser.Tactic.seq1 (Lean.Parser.sepBy1 Lean.Parser.tacticParser ";\n" (Lean.Parser.symbol ";\n") true)

def Lean.Parser.darrow : Lean.Parser.Parser

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• Lean.Parser.darrow = Lean.Parser.symbol " => "

def Lean.Parser.semicolonOrLinebreak : Lean.Parser.Parser

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def Lean.Parser.Termination.terminationBy : Lean.Parser.Parser

Specify a termination argument for well-founded termination:

termination_by a - b

indicates that termination of the currently defined recursive function follows because the difference between the the arguments a and b.

If the fuction takes further argument after the colon, you can name them as follows:

def example (a : Nat) : Nat → Nat → Nat :=
termination_by b c => a - b

If omitted, a termination argument will be inferred. If written as termination_by?, the inferrred termination argument will be suggested.

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def Lean.Parser.Termination.terminationBy? : Lean.Parser.Parser

Specify a termination argument for well-founded termination:

termination_by a - b

indicates that termination of the currently defined recursive function follows because the difference between the the arguments a and b.

If the fuction takes further argument after the colon, you can name them as follows:

def example (a : Nat) : Nat → Nat → Nat :=
termination_by b c => a - b

If omitted, a termination argument will be inferred. If written as termination_by?, the inferrred termination argument will be suggested.

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def Lean.Parser.Termination.decreasingBy : Lean.Parser.Parser

Manually prove that the termination argument (as specified with termination_by or inferred) decreases at each recursive call.

By default, the tactic decreasing_tactic is used.

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def Lean.Parser.Termination.suffix : Lean.Parser.Parser

Termination hints are termination_by and decreasing_by, in that order.

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Built-in parsers

def Lean.Parser.Term.byTactic : Lean.Parser.Parser

by tac constructs a term of the expected type by running the tactic(s) tac.

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def Lean.Parser.Term.byTactic' : Lean.Parser.Parser

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def Lean.Parser.Term.optSemicolon (p : Lean.Parser.Parser) : Lean.Parser.Parser

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def Lean.Parser.Term.ident : Lean.Parser.Parser

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• Lean.Parser.Term.ident = HAndThen.hAndThen (Lean.Parser.checkPrec Lean.Parser.maxPrec) fun (x : Unit) => Lean.Parser.ident

def Lean.Parser.Term.num : Lean.Parser.Parser

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• Lean.Parser.Term.num = HAndThen.hAndThen (Lean.Parser.checkPrec Lean.Parser.maxPrec) fun (x : Unit) => Lean.Parser.numLit

def Lean.Parser.Term.scientific : Lean.Parser.Parser

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• Lean.Parser.Term.scientific = HAndThen.hAndThen (Lean.Parser.checkPrec Lean.Parser.maxPrec) fun (x : Unit) => Lean.Parser.scientificLit

def Lean.Parser.Term.str : Lean.Parser.Parser

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• Lean.Parser.Term.str = HAndThen.hAndThen (Lean.Parser.checkPrec Lean.Parser.maxPrec) fun (x : Unit) => Lean.Parser.strLit

def Lean.Parser.Term.char : Lean.Parser.Parser

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• Lean.Parser.Term.char = HAndThen.hAndThen (Lean.Parser.checkPrec Lean.Parser.maxPrec) fun (x : Unit) => Lean.Parser.charLit

def Lean.Parser.Term.type : Lean.Parser.Parser

A type universe. Type ≡ Type 0, Type u ≡ Sort (u + 1).

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def Lean.Parser.Term.sort : Lean.Parser.Parser

A specific universe in Lean's infinite hierarchy of universes.

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def Lean.Parser.Term.prop : Lean.Parser.Parser

The universe of propositions. Prop ≡ Sort 0.

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def Lean.Parser.Term.hole : Lean.Parser.Parser

A placeholder term, to be synthesized by unification.

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def Lean.Parser.Term.syntheticHole : Lean.Parser.Parser

Parses a "synthetic hole", that is, ?foo or ?_. This syntax is used to construct named metavariables.

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def Lean.Parser.Term.omission : Lean.Parser.Parser

Denotes a term that was omitted by the pretty printer. This is only meant to be used for pretty printing, however for copy/paste friendliness it elaborates like _ while logging a warning. The presence of ⋯ in pretty printer output is controlled by the pp.deepTerms and pp.proofs options.

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def Lean.Parser.Term.binderIdent : Lean.Parser.Parser

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• Lean.Parser.Term.binderIdent = HOrElse.hOrElse Lean.Parser.Term.ident fun (x : Unit) => Lean.Parser.Term.hole

def Lean.Parser.Term.sorry : Lean.Parser.Parser

A temporary placeholder for a missing proof or value.

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def Lean.Parser.Term.cdot : Lean.Parser.Parser

A placeholder for an implicit lambda abstraction's variable. The lambda abstraction is scoped to the surrounding parentheses. For example, (· + ·) is equivalent to fun x y => x + y.

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def Lean.Parser.Term.typeAscription : Lean.Parser.Parser

Type ascription notation: (0 : Int) instructs Lean to process 0 as a value of type Int. An empty type ascription (e :) elaborates e without the expected type. This is occasionally useful when Lean's heuristics for filling arguments from the expected type do not yield the right result.

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def Lean.Parser.Term.tuple : Lean.Parser.Parser

Tuple notation; () is short for Unit.unit, (a, b, c) for Prod.mk a (Prod.mk b c), etc.

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def Lean.Parser.Term.paren : Lean.Parser.Parser

Parentheses, used for grouping expressions (e.g., a * (b + c)). Can also be used for creating simple functions when combined with ·. Here are some examples:

• (· + 1) is shorthand for fun x => x + 1
• (· + ·) is shorthand for fun x y => x + y
• (f · a b) is shorthand for fun x => f x a b
• (h (· + 1) ·) is shorthand for fun x => h (fun y => y + 1) x
• also applies to other parentheses-like notations such as (·, 1)

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def Lean.Parser.Term.anonymousCtor : Lean.Parser.Parser

The anonymous constructor ⟨e, ...⟩ is equivalent to c e ... if the expected type is an inductive type with a single constructor c. If more terms are given than c has parameters, the remaining arguments are turned into a new anonymous constructor application. For example, ⟨a, b, c⟩ : α × (β × γ) is equivalent to ⟨a, ⟨b, c⟩⟩.

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def Lean.Parser.Term.optIdent : Lean.Parser.Parser

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• Lean.Parser.Term.optIdent = Lean.Parser.optional (Lean.Parser.atomic (HAndThen.hAndThen Lean.Parser.Term.ident fun (x : Unit) => Lean.Parser.symbol " : "))

def Lean.Parser.Term.fromTerm : Lean.Parser.Parser

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def Lean.Parser.Term.showRhs : Lean.Parser.Parser

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• Lean.Parser.Term.showRhs = HOrElse.hOrElse Lean.Parser.Term.fromTerm fun (x : Unit) => Lean.Parser.Term.byTactic'

def Lean.Parser.Term.sufficesDecl : Lean.Parser.Parser

A sufficesDecl represents everything that comes after the suffices keyword: an optional x :, then a term ty, then from val or by tac.

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def Lean.Parser.Term.suffices : Lean.Parser.Parser

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def Lean.Parser.Term.show : Lean.Parser.Parser

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def Lean.Parser.Term.structInstArrayRef : Lean.Parser.Parser

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def Lean.Parser.Term.structInstLVal : Lean.Parser.Parser

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def Lean.Parser.Term.structInstField : Lean.Parser.Parser

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def Lean.Parser.Term.structInstFieldAbbrev : Lean.Parser.Parser

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def Lean.Parser.Term.optEllipsis : Lean.Parser.Parser

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def Lean.Parser.Term.structInst : Lean.Parser.Parser

Structure instance. { x := e, ... } assigns e to field x, which may be inherited. If e is itself a variable called x, it can be elided: fun y => { x := 1, y }. A structure update of an existing value can be given via with: { point with x := 1 }. The structure type can be specified if not inferable: { x := 1, y := 2 : Point }.

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def Lean.Parser.Term.typeSpec : Lean.Parser.Parser

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def Lean.Parser.Term.optType : Lean.Parser.Parser

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• Lean.Parser.Term.optType = Lean.Parser.optional Lean.Parser.Term.typeSpec

def Lean.Parser.Term.explicit : Lean.Parser.Parser

@x disables automatic insertion of implicit parameters of the constant x. @e for any term e also disables the insertion of implicit lambdas at this position.

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def Lean.Parser.Term.inaccessible : Lean.Parser.Parser

.(e) marks an "inaccessible pattern", which does not influence evaluation of the pattern match, but may be necessary for type-checking. In contrast to regular patterns, e may be an arbitrary term of the appropriate type.

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def Lean.Parser.Term.binderType (requireType : optParam Bool false) : Lean.Parser.Parser

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def Lean.Parser.Term.binderTactic : Lean.Parser.Parser

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def Lean.Parser.Term.binderDefault : Lean.Parser.Parser

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def Lean.Parser.Term.binderDefault.parenthesizer : Lean.PrettyPrinter.Parenthesizer

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def Lean.Parser.Term.explicitBinder (requireType : optParam Bool false) : Lean.Parser.Parser

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def Lean.Parser.Term.implicitBinder (requireType : optParam Bool false) : Lean.Parser.Parser

Implicit binder. In regular applications without @, it is automatically inserted and solved by unification whenever all explicit parameters before it are specified.

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def Lean.Parser.Term.strictImplicitLeftBracket : Lean.Parser.Parser

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def Lean.Parser.Term.strictImplicitRightBracket : Lean.Parser.Parser

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def Lean.Parser.Term.strictImplicitBinder (requireType : optParam Bool false) : Lean.Parser.Parser

Strict-implicit binder. In contrast to { ... } regular implicit binders, a strict-implicit binder is inserted automatically only when at least one subsequent explicit parameter is specified.

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def Lean.Parser.Term.instBinder : Lean.Parser.Parser

Instance-implicit binder. In regular applications without @, it is automatically inserted and solved by typeclass inference of the specified class.

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def Lean.Parser.Term.bracketedBinder (requireType : optParam Bool false) : Lean.Parser.Parser

A bracketedBinder matches any kind of binder group that uses some kind of brackets:

• An explicit binder like (x y : A)
• An implicit binder like {x y : A}
• A strict implicit binder, ⦃y z : A⦄ or its ASCII alternative {{y z : A}}
• An instance binder [A] or [x : A] (multiple variables are not allowed here)

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def Lean.Parser.Term.depArrow : Lean.Parser.Parser

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def Lean.Parser.Term.forall : Lean.Parser.Parser

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def Lean.Parser.Term.matchAlt (rhsParser : optParam Lean.Parser.Parser Lean.Parser.termParser) : Lean.Parser.Parser

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def Lean.Parser.Term.matchAltExpr : Lean.Parser.Parser

Useful for syntax quotations. Note that generic patterns such as `(matchAltExpr| | ... => $rhs) should also work with other rhsParsers (of arity 1).

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• Lean.Parser.Term.matchAltExpr = Lean.Parser.Term.matchAlt

instance Lean.Parser.Term.instCoeTSyntaxConsSyntaxNodeKindMkStr4Nil : Coe (Lean.TSyntax `Lean.Parser.Term.matchAltExpr) (Lean.TSyntax `Lean.Parser.Term.matchAlt)

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• Lean.Parser.Term.instCoeTSyntaxConsSyntaxNodeKindMkStr4Nil = { coe := fun (stx : Lean.TSyntax `Lean.Parser.Term.matchAltExpr) => { raw := stx.raw } }

def Lean.Parser.Term.matchAlts (rhsParser : optParam Lean.Parser.Parser Lean.Parser.termParser) : Lean.Parser.Parser

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def Lean.Parser.Term.matchDiscr : Lean.Parser.Parser

matchDiscr matches a "match discriminant", either h : tm or tm, used in match as match h1 : e1, e2, h3 : e3 with ....

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def Lean.Parser.Term.trueVal : Lean.Parser.Parser

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def Lean.Parser.Term.falseVal : Lean.Parser.Parser

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def Lean.Parser.Term.generalizingParam : Lean.Parser.Parser

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def Lean.Parser.Term.motive : Lean.Parser.Parser

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def Lean.Parser.Term.match : Lean.Parser.Parser

Pattern matching. match e, ... with | p, ... => f | ... matches each given term e against each pattern p of a match alternative. When all patterns of an alternative match, the match term evaluates to the value of the corresponding right-hand side f with the pattern variables bound to the respective matched values. If used as match h : e, ... with | p, ... => f | ..., h : e = p is available within f.

When not constructing a proof, match does not automatically substitute variables matched on in dependent variables' types. Use match (generalizing := true) ... to enforce this.

Syntax quotations can also be used in a pattern match. This matches a Syntax value against quotations, pattern variables, or _.

Quoted identifiers only match identical identifiers - custom matching such as by the preresolved names only should be done explicitly.

Syntax.atoms are ignored during matching by default except when part of a built-in literal. For users introducing new atoms, we recommend wrapping them in dedicated syntax kinds if they should participate in matching. For example, in

syntax "c" ("foo" <|> "bar") ...

foo and bar are indistinguishable during matching, but in

syntax foo := "foo"
syntax "c" (foo <|> "bar") ...

they are not.

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def Lean.Parser.Term.nomatch : Lean.Parser.Parser

Empty match/ex falso. nomatch e is of arbitrary type α : Sort u if Lean can show that an empty set of patterns is exhaustive given e's type, e.g. because it has no constructors.

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def Lean.Parser.Term.nofun : Lean.Parser.Parser

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def Lean.Parser.Term.funImplicitBinder : Lean.Parser.Parser

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def Lean.Parser.Term.funStrictImplicitBinder : Lean.Parser.Parser

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def Lean.Parser.Term.funBinder : Lean.Parser.Parser

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def Lean.Parser.Term.basicFun : Lean.Parser.Parser

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def Lean.Parser.Term.fun : Lean.Parser.Parser

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def Lean.Parser.Term.optExprPrecedence : Lean.Parser.Parser

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def Lean.Parser.Term.withAnonymousAntiquot : Lean.Parser.Parser

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def Lean.Parser.Term.leading_parser : Lean.Parser.Parser

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def Lean.Parser.Term.trailing_parser : Lean.Parser.Parser

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def Lean.Parser.Term.borrowed : Lean.Parser.Parser

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def Lean.Parser.Term.quotedName : Lean.Parser.Parser

A literal of type Name.

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def Lean.Parser.Term.doubleQuotedName : Lean.Parser.Parser

A resolved name literal. Evaluates to the full name of the given constant if existent in the current context, or else fails.

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def Lean.Parser.Term.letIdBinder : Lean.Parser.Parser

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def Lean.Parser.Term.letIdLhs : Lean.Parser.Parser

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def Lean.Parser.Term.letIdDecl : Lean.Parser.Parser

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def Lean.Parser.Term.letPatDecl : Lean.Parser.Parser

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def Lean.Parser.Term.letEqnsDecl : Lean.Parser.Parser

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def Lean.Parser.Term.letDecl : Lean.Parser.Parser

letDecl matches the body of a let declaration let f x1 x2 := e, let pat := e (where pat is an arbitrary term) or let f | pat1 => e1 | pat2 => e2 ... (a pattern matching declaration), except for the let keyword itself. let rec declarations are not handled here.

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def Lean.Parser.Term.let : Lean.Parser.Parser

let is used to declare a local definition. Example:

let x := 1
let y := x + 1
x + y

Since functions are first class citizens in Lean, you can use let to declare local functions too.

let double := fun x => 2*x
double (double 3)

For recursive definitions, you should use let rec. You can also perform pattern matching using let. For example, assume p has type Nat × Nat, then you can write

let (x, y) := p
x + y

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def Lean.Parser.Term.let_fun : Lean.Parser.Parser

let_fun x := v; b is syntax sugar for (fun x => b) v. It is very similar to let x := v; b, but they are not equivalent. In let_fun, the value v has been abstracted away and cannot be accessed in b.

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def Lean.Parser.Term.let_delayed : Lean.Parser.Parser

let_delayed x := v; b is similar to let x := v; b, but b is elaborated before v.

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def Lean.Parser.Term.let_tmp : Lean.Parser.Parser

let-declaration that is only included in the elaborated term if variable is still there. It is often used when building macros.

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def Lean.Parser.Term.haveIdLhs : Lean.Parser.Parser

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def Lean.Parser.Term.haveIdDecl : Lean.Parser.Parser

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def Lean.Parser.Term.haveEqnsDecl : Lean.Parser.Parser

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def Lean.Parser.Term.haveDecl : Lean.Parser.Parser

haveDecl matches the body of a have declaration: have := e, have f x1 x2 := e, have pat := e (where pat is an arbitrary term) or have f | pat1 => e1 | pat2 => e2 ... (a pattern matching declaration), except for the have keyword itself.

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def Lean.Parser.Term.have : Lean.Parser.Parser

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def Lean.Parser.Term.haveI : Lean.Parser.Parser

haveI behaves like have, but inlines the value instead of producing a let_fun term.

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def Lean.Parser.Term.letI : Lean.Parser.Parser

letI behaves like let, but inlines the value instead of producing a let_fun term.

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def Lean.Parser.Term.scoped : Lean.Parser.Parser

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def Lean.Parser.Term.local : Lean.Parser.Parser

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def Lean.Parser.Term.attrKind : Lean.Parser.Parser

attrKind matches ("scoped" <|> "local")?, used before an attribute like @[local simp].

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def Lean.Parser.Term.attrInstance : Lean.Parser.Parser

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def Lean.Parser.Term.attributes : Lean.Parser.Parser

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def Lean.Parser.Term.letRecDecl : Lean.Parser.Parser

letRecDecl matches the body of a let-rec declaration: a doc comment, attributes, and then a let declaration without the let keyword, such as /-- foo -/ @[simp] bar := 1.

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def Lean.Parser.Term.letRecDecls : Lean.Parser.Parser

letRecDecls matches letRecDecl,+, a comma-separated list of let-rec declarations (see letRecDecl).

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def Lean.Parser.Term.letrec : Lean.Parser.Parser

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def Lean.Parser.Term.whereDecls : Lean.Parser.Parser

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def Lean.Parser.Term.matchAltsWhereDecls : Lean.Parser.Parser

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def Lean.Parser.Term.noindex : Lean.Parser.Parser

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def Lean.Parser.Term.unsafe : Lean.Parser.Parser

unsafe t : α is an expression constructor which allows using unsafe declarations inside the body of t : α, by creating an auxiliary definition containing t and using implementedBy to wrap it in a safe interface. It is required that α is nonempty for this to be sound, but even beyond that, an unsafe block should be carefully inspected for memory safety because the compiler is unable to guarantee the safety of the operation.

For example, the evalExpr function is unsafe, because the compiler cannot guarantee that when you call evalExpr Foo ``Foo e that the type Foo corresponds to the name Foo, but in a particular use case, we can ensure this, so unsafe (evalExpr Foo ``Foo e) is a correct usage.

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def Lean.Parser.Term.binrel : Lean.Parser.Parser

binrel% r a b elaborates r a b as a binary relation using the type propogation protocol in Lean.Elab.Extra.

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def Lean.Parser.Term.binrel_no_prop : Lean.Parser.Parser

binrel_no_prop% r a b is similar to binrel% r a b, but it coerces Prop arguments into Bool.

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def Lean.Parser.Term.binop : Lean.Parser.Parser

binop% f a b elaborates f a b as a binary operation using the type propogation protocol in Lean.Elab.Extra.

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def Lean.Parser.Term.binop_lazy : Lean.Parser.Parser

binop_lazy% is similar to binop% f a b, but it wraps b as a function from Unit.

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def Lean.Parser.Term.leftact : Lean.Parser.Parser

leftact% f a b elaborates f a b as a left action using the type propogation protocol in Lean.Elab.Extra. In particular, it is like a unary operation with a fixed parameter a, where only the right argument b participates in the operator coercion elaborator.

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def Lean.Parser.Term.rightact : Lean.Parser.Parser

rightact% f a b elaborates f a b as a right action using the type propogation protocol in Lean.Elab.Extra. In particular, it is like a unary operation with a fixed parameter b, where only the left argument a participates in the operator coercion elaborator.

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def Lean.Parser.Term.unop : Lean.Parser.Parser

unop% f a elaborates f a as a unary operation using the type propogation protocol in Lean.Elab.Extra.

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def Lean.Parser.Term.forInMacro : Lean.Parser.Parser

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def Lean.Parser.Term.forInMacro' : Lean.Parser.Parser

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def Lean.Parser.Term.declName : Lean.Parser.Parser

A macro which evaluates to the name of the currently elaborating declaration.

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def Lean.Parser.Term.withDeclName : Lean.Parser.Parser

• with_decl_name% id e elaborates e in a context while changing the effective declaration name to id.
• with_decl_name% ?id e does the same, but resolves id as a new definition name (appending the current namespaces).

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def Lean.Parser.Term.typeOf : Lean.Parser.Parser

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def Lean.Parser.Term.ensureTypeOf : Lean.Parser.Parser

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def Lean.Parser.Term.ensureExpectedType : Lean.Parser.Parser

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def Lean.Parser.Term.noImplicitLambda : Lean.Parser.Parser

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def Lean.Parser.Term.clear : Lean.Parser.Parser

clear% x; e elaborates x after clearing the free variable x from the local context. If x cannot be cleared (due to dependencies), it will keep x without failing.

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def Lean.Parser.Term.letMVar : Lean.Parser.Parser

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def Lean.Parser.Term.waitIfTypeMVar : Lean.Parser.Parser

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def Lean.Parser.Term.waitIfTypeContainsMVar : Lean.Parser.Parser

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def Lean.Parser.Term.waitIfContainsMVar : Lean.Parser.Parser

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def Lean.Parser.Term.defaultOrOfNonempty : Lean.Parser.Parser

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def Lean.Parser.Term.noErrorIfUnused : Lean.Parser.Parser

Helper parser for marking match-alternatives that should not trigger errors if unused. We use them to implement macro_rules and elab_rules

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def Lean.Parser.Term.namedArgument : Lean.Parser.Parser

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def Lean.Parser.Term.ellipsis : Lean.Parser.Parser

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def Lean.Parser.Term.argument : Lean.Parser.Parser

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def Lean.Parser.Term.app : Lean.Parser.TrailingParser

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• Lean.Parser.Term.app = Lean.Parser.trailingNode `Lean.Parser.Term.app Lean.Parser.leadPrec Lean.Parser.maxPrec (Lean.Parser.many1 Lean.Parser.Term.argument)

def Lean.Parser.Term.proj : Lean.Parser.TrailingParser

The extended field notation e.f is roughly short for T.f e where T is the type of e. More precisely,

• if e is of a function type, e.f is translated to Function.f (p := e) where p is the first explicit parameter of function type
• if e is of a named type T ... and there is a declaration T.f (possibly from export), e.f is translated to T.f (p := e) where p is the first explicit parameter of type T ...
• otherwise, if e is of a structure type, the above is repeated for every base type of the structure.

The field index notation e.i, where i is a positive number, is short for accessing the i-th field (1-indexed) of e if it is of a structure type.

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def Lean.Parser.Term.completion : Lean.Parser.TrailingParser

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• Lean.Parser.Term.completion = Lean.Parser.trailingNode `Lean.Parser.Term.completion 1024 0 (HAndThen.hAndThen Lean.Parser.checkNoWsBefore fun (x : Unit) => Lean.Parser.symbol ".")

def Lean.Parser.Term.arrow : Lean.Parser.TrailingParser

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def Lean.Parser.Term.isIdent (stx : Lean.Syntax) : Bool

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• Lean.Parser.Term.isIdent stx = (Lean.Syntax.isAntiquot stx || Lean.Syntax.isIdent stx)

def Lean.Parser.Term.explicitUniv : Lean.Parser.TrailingParser

x.{u, ...} explicitly specifies the universes u, ... of the constant x.

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def Lean.Parser.Term.namedPattern : Lean.Parser.TrailingParser

x@e or x:h@e matches the pattern e and binds its value to the identifier x. If present, the identifier h is bound to a proof of x = e.

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def Lean.Parser.Term.pipeProj : Lean.Parser.TrailingParser

e |>.x is a shorthand for (e).x. It is especially useful for avoiding parentheses with repeated applications.

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def Lean.Parser.Term.pipeCompletion : Lean.Parser.TrailingParser

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• Lean.Parser.Term.pipeCompletion = Lean.Parser.trailingNode `Lean.Parser.Term.pipeCompletion Lean.Parser.minPrec 0 (Lean.Parser.symbol " |>.")

def Lean.Parser.Term.subst : Lean.Parser.TrailingParser

h ▸ e is a macro built on top of Eq.rec and Eq.symm definitions. Given h : a = b and e : p a, the term h ▸ e has type p b. You can also view h ▸ e as a "type casting" operation where you change the type of e by using h. See the Chapter "Quantifiers and Equality" in the manual "Theorem Proving in Lean" for additional information.

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def Lean.Parser.Term.bracketedBinderF : Lean.Parser.Parser

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• Lean.Parser.Term.bracketedBinderF = Lean.Parser.Term.bracketedBinder

instance Lean.Parser.Term.instCoeTSyntaxConsSyntaxNodeKindMkStr4Nil_1 : Coe (Lean.TSyntax `Lean.Parser.Term.bracketedBinderF) (Lean.TSyntax `Lean.Parser.Term.bracketedBinder)

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• Lean.Parser.Term.instCoeTSyntaxConsSyntaxNodeKindMkStr4Nil_1 = { coe := fun (s : Lean.TSyntax `Lean.Parser.Term.bracketedBinderF) => { raw := s.raw } }

def Lean.Parser.Term.panic : Lean.Parser.Parser

panic! msg formally evaluates to @Inhabited.default α if the expected type α implements Inhabited. At runtime, msg and the file position are printed to stderr unless the C function lean_set_panic_messages(false) has been executed before. If the C function lean_set_exit_on_panic(true) has been executed before, the process is then aborted.

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def Lean.Parser.Term.unreachable : Lean.Parser.Parser

A shorthand for panic! "unreachable code has been reached".

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def Lean.Parser.Term.dbgTrace : Lean.Parser.Parser

dbg_trace e; body evaluates to body and prints e (which can be an interpolated string literal) to stderr. It should only be used for debugging.

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def Lean.Parser.Term.assert : Lean.Parser.Parser

assert! cond panics if cond evaluates to false.

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def Lean.Parser.Term.macroArg : Lean.Parser.Parser

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• Lean.Parser.Term.macroArg = Lean.Parser.termParser Lean.Parser.maxPrec

def Lean.Parser.Term.macroDollarArg : Lean.Parser.Parser

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def Lean.Parser.Term.macroLastArg : Lean.Parser.Parser

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• Lean.Parser.Term.macroLastArg = HOrElse.hOrElse Lean.Parser.Term.macroDollarArg fun (x : Unit) => Lean.Parser.Term.macroArg

def Lean.Parser.Term.stateRefT : Lean.Parser.Parser

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def Lean.Parser.Term.dynamicQuot : Lean.Parser.Parser

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def Lean.Parser.Term.dotIdent : Lean.Parser.Parser

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def Lean.Parser.Term.showTermElabImpl : Lean.Parser.Parser

Implementation of the show_term term elaborator.

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match_expr support.

def Lean.Parser.Term.matchExprPat : Lean.Parser.Parser

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def Lean.Parser.Term.matchExprAlt (rhsParser : Lean.Parser.Parser) : Lean.Parser.Parser

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def Lean.Parser.Term.matchExprElseAlt (rhsParser : Lean.Parser.Parser) : Lean.Parser.Parser

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def Lean.Parser.Term.matchExprAlts (rhsParser : Lean.Parser.Parser) : Lean.Parser.Parser

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def Lean.Parser.Term.matchExpr : Lean.Parser.Parser

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def Lean.Parser.Term.letExpr : Lean.Parser.Parser

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def Lean.Parser.Tactic.quot : Lean.Parser.Parser

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def Lean.Parser.Tactic.quotSeq : Lean.Parser.Parser

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