[MonoDevelop] Latest build broken?

[Matt Calder]

I just rebuilt MD from master, and when I try to open project source files
I get:

System.MissingMethodException: Method not found:
'Mono.TextEditor.TextDocument.UpdateFoldSegmentWorker'.
  at MonoDevelop.SourceEditor.SourceEditorWidget.SetParsedDocument
(MonoDevelop.Ide.TypeSystem.ParsedDocument newDocument, Boolean
runInThread) [0x00048] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorWidget.cs:548

  at MonoDevelop.SourceEditor.SourceEditorWidget.UpdateParsedDocument
(MonoDevelop.Ide.TypeSystem.ParsedDocument document) [0x00022] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorWidget.cs:527

  at MonoDevelop.SourceEditor.SourceEditorView.RunFirstTimeFoldUpdate
(System.String text) [0x00093] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorView.cs:516

  at MonoDevelop.SourceEditor.SourceEditorView.Load (System.String
fileName, System.Text.Encoding loadEncoding) [0x000df] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorView.cs:577

  at MonoDevelop.SourceEditor.SourceEditorView.Load (System.String
fileName) [0x00001] in
/home/calder/tmp/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorView.cs:496

  at MonoDevelop.Ide.Gui.LoadFileWrapper.Invoke (System.String fileName)
[0x00100] in
/home/calder/tmp/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:1126


I rebuilt mono too just in case, that did not help. Here are my Help-About
details:

MonoDevelop 3.1.0
Installation UUID: feaee481-7c2a-4781-a090-d6228809132d
Runtime:
    Mono 2.11.1 ((no/426188e Fri Jun  1 10:29:38 EDT 2012) (64-bit)
    GTK 2.22.0
    GTK# (2.12.0.0)
Build information:
    Git revision: 3e0a7304e5bc9b542207aa9c1ede5fd326296724-dirty
    Build date: 2012-06-01 14:44:34+0000
Operating System:
    Linux
    Linux pharos 2.6.35-32-generic #67-Ubuntu SMP Mon Mar 5 19:39:49 UTC
2012 x86_64 GNU/Linux
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