Documentation

Lean.Message

def Lean.mkErrorStringWithPos (fileName : String) (pos : Lean.Position) (msg : String) (endPos : optParam (Option Lean.Position) none) :
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    A naming context is the information needed to shorten names in pretty printing.

    It gives the current namespace and the list of open declarations.

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      structure Lean.TraceData :
      • cls : Lake.Name

        Trace class, e.g. Elab.step.

      • startTime : Float

        Start time in seconds; 0 if unknown to avoid Option allocation.

      • stopTime : Float

        Stop time in seconds; 0 if unknown to avoid Option allocation.

      • collapsed : Bool

        Whether trace node defaults to collapsed in the infoview.

      • tag : String

        Optional tag shown in trace.profiler.output output after the trace class name.

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        Structured message data. We use it for reporting errors, trace messages, etc.

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          Eagerly formatted text.

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            Lazy message data production, with access to the context as given by a surrounding MessageData.withContext (which is expected to exist).

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              Returns true when the message contains a MessageData.tagged tag .. constructor where p tag is true.

              This does not descend into lazily generated subtress (.ofLazy); message tags of interest (like those added by logLinter) are expected to be near the root of the MessageData, and not hidden inside .ofLazy.

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              • Lean.MessageData.mkPPContext nCtx ctx = { env := ctx.env, mctx := ctx.mctx, lctx := ctx.lctx, opts := ctx.opts, currNamespace := nCtx.currNamespace, openDecls := nCtx.openDecls }
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                          • msgData.toString = do let __do_liftmsgData.format pure (toString __do_lift)
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                            Wrap the given message in l and r. See also Format.bracket.

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                              Wrap the given message in parentheses ().

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                                Wrap the given message in square brackets [].

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                                  Write the given list of messages as a list, separating each item with ,\n and surrounding with square brackets.

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                                    Puts MessageData into a comma-separated list with "and" at the back (no Oxford comma). Best used on non-empty lists; returns "– none –" for an empty list.

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                                      structure Lean.BaseMessage (α : Type u) :

                                      A BaseMessage is a richly formatted piece of information emitted by Lean. They are rendered by client editors in the infoview and in diagnostic windows. There are two varieties in the Lean core:

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                                        instance Lean.instInhabitedBaseMessage :
                                        {a : Type u_1} → [inst : Inhabited a] → Inhabited (Lean.BaseMessage a)
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                                        instance Lean.instToJsonBaseMessage :
                                        {α : Type u_1} → [inst : Lean.ToJson α] → Lean.ToJson (Lean.BaseMessage α)
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                                        • Lean.instToJsonBaseMessage = { toJson := Lean.toJsonBaseMessage✝ }
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                                        • Lean.instFromJsonBaseMessage = { fromJson? := Lean.fromJsonBaseMessage✝ }
                                        @[reducible, inline]

                                        A Message is a richly formatted piece of information emitted by Lean. They are rendered by client editors in the infoview and in diagnostic windows.

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                                          @[reducible, inline]

                                          A SerialMessage is a Message whose MessageData has been eagerly serialized and is thus appropriate for use in pure contexts where the effectful MessageData.toString cannot be used.

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                                            @[inline]
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                                                @[inline]
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                                                  • msg.toString includeEndPos = do let __do_liftmsg.serialize pure (inline (__do_lift.toString includeEndPos))
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                                                      A persistent array of messages.

                                                      In the Lean elaborator, we use a fresh message log per command but may also report diagnostics at various points inside a command, which will empty unreported and updated hadErrors accordingly (see CoreM.getAndEmptyMessageLog).

                                                      • hadErrors : Bool

                                                        If true, there was an error in the log previously that has already been reported to the user and removed from the log. Thus we say that in the current context (usually the current command), we "have errors" if either this flag is set or there is an error in msgs; see MessageLog.hasErrors. If we have errors, we suppress some error messages that are often the result of a previous error.

                                                      • The list of messages not already reported, in insertion order.

                                                      • reportedKinds : Lean.NameSet

                                                        Set of message kinds that have been added to the log. For example, we have the kind unsafe.exponentiation.warning for warning messages associated with the configuration option exponentiation.threshold. We don't produce a warning if the kind is already in the following set.

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                                                          • log.hasUnreported = !log.unreported.isEmpty
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                                                            • Lean.MessageLog.add msg log = { hadErrors := log.hadErrors, unreported := log.unreported.push msg, reportedKinds := log.reportedKinds }
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                                                              • l₁.append l₂ = { hadErrors := l₁.hadErrors || l₂.hadErrors, unreported := l₁.unreported ++ l₂.unreported, reportedKinds := }
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                                                                      def Lean.MessageLog.forM {m : TypeType} [Monad m] (log : Lean.MessageLog) (f : Lean.Messagem Unit) :
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                                                                      • log.forM f = log.unreported.forM f
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                                                                        Converts the unreported messages to a list, oldest message first.

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                                                                        • log.toList = log.unreported.toList
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                                                                          Converts the unreported messages to an array, oldest message first.

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                                                                          • log.toArray = log.unreported.toArray
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