Documentation

Lean.Elab.Do.InferControlInfo

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structure Lean.Elab.Do.ControlInfo :
Type

Represents information about what control effects a do block has.

  • breaks : Bool

    The do block may break.

  • continues : Bool

    The do block may continue.

  • returnsEarly : Bool

    The do block may return early.

  • numRegularExits : Nat

    The number of regular exit paths the do block has. Corresponds to the number of jumps to an ambient join point.

  • reassigns : NameSet

    The variables that are reassigned in the do block.

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    def Lean.Elab.Do.instInhabitedControlInfo.default :
    ControlInfo
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      @[implicit_reducible]
      instance Lean.Elab.Do.instInhabitedControlInfo :
      Inhabited ControlInfo
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      def Lean.Elab.Do.ControlInfo.pure :
      ControlInfo
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        def Lean.Elab.Do.ControlInfo.sequence (a b : ControlInfo) :
        ControlInfo
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          def Lean.Elab.Do.ControlInfo.alternative (a b : ControlInfo) :
          ControlInfo
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            @[implicit_reducible]
            instance Lean.Elab.Do.instToMessageDataControlInfo :
            ToMessageData ControlInfo
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            @[reducible, inline]
            abbrev Lean.Elab.Do.ControlInfoHandler :
            Type

            A handler for inferring ControlInfo from a doElem syntax. Register with @[doElem_control_info parserName].

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              unsafe def Lean.Elab.Do.mkControlInfoElemAttributeUnsafe (ref : Name) :
              IO (KeyedDeclsAttribute ControlInfoHandler)
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                @[implemented_by Lean.Elab.Do.mkControlInfoElemAttributeUnsafe]
                opaque Lean.Elab.Do.mkControlInfoElemAttribute (ref : Name) :
                IO (KeyedDeclsAttribute ControlInfoHandler)
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                opaque Lean.Elab.Do.controlInfoElemAttribute :
                KeyedDeclsAttribute ControlInfoHandler

                Registers a ControlInfo inference handler for the given doElem syntax node kind.

                A handler should have type ControlInfoHandler (i.e. TSyntax \doElem → TermElabM ControlInfo). For pure handlers, use fun stx => return ControlInfo.pure`.

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                partial def Lean.Elab.Do.InferControlInfo.ofElem (stx : TSyntax `doElem) :
                TermElabM ControlInfo
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                partial def Lean.Elab.Do.InferControlInfo.ofLetOrReassignArrow (reassignment : Bool) (decl : TSyntax [`Lean.Parser.Term.doIdDecl, `Lean.Parser.Term.doPatDecl]) :
                TermElabM ControlInfo
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                partial def Lean.Elab.Do.InferControlInfo.ofLetOrReassign (reassigned : Array Ident) (rhs? : Option (TSyntax `doElem)) (otherwise? body? : Option (TSyntax `Lean.Parser.Term.doSeqIndent)) :
                TermElabM ControlInfo
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                partial def Lean.Elab.Do.InferControlInfo.ofSeq (stx : TSyntax `Lean.Parser.Term.doSeq) :
                TermElabM ControlInfo
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                partial def Lean.Elab.Do.InferControlInfo.ofOptionSeq (stx? : Option (TSyntax `Lean.Parser.Term.doSeq)) :
                TermElabM ControlInfo
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                def Lean.Elab.Do.inferControlInfoSeq (doSeq : TSyntax `Lean.Parser.Term.doSeq) :
                TermElabM ControlInfo
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                  def Lean.Elab.Do.inferControlInfoElem (doElem : TSyntax `doElem) :
                  TermElabM ControlInfo
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