Bug 6996 - NullReferenceException in ICSharpCode.NRefactory.CSharp.Refactoring.TypeSystemAstBuilder.ConvertConstructor
Summary: NullReferenceException in ICSharpCode.NRefactory.CSharp.Refactoring.TypeSyste...
Status: RESOLVED FIXED
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: C# Binding ()
Version: 3.0.x
Hardware: Macintosh Mac OS
: High normal
Target Milestone: ---
Assignee: Mike Krüger
URL:
Depends on:
Blocks:
 
Reported: 2012-09-07 13:46 UTC by Chris Wenham
Modified: 2012-09-10 14:40 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Related Links:
Status:
RESOLVED FIXED

Comment 3 Chris Wenham 2012-09-10 11:58:35 UTC
I am able to reproduce the bug with the test project. It's a bit heisenbuggish, but the following use case is reliable for me:

 1) Load ExchangeRateTest.sln
 2) Open ExchangeRates.cs in IDE
 3) Scroll to bottom of document
 4) Add a blank new line to the method GetCurrencyName()
 5) Hover mouse over some symbols to see tooltips
 6) Wait
 7) NullReferenceException is thrown after 10-30 seconds. Same stack trace.

 Ran through it a few times with a stopwatch, but it didn't always occur after the same delay.

Here's the output of About MonoDevelop -> Version Information:


MonoDevelop 3.0.4.6
Installation UUID: 549464c3-1ae1-4db2-9af6-3a3f6546f191
Runtime:
	Mono 2.10.9 (tarball)
	GTK 2.24.10
	GTK# (2.12.0.0)
	Package version: 210090011
Apple Developer Tools:
	 Xcode 4.4.1 (1488)
	 Build 4F1003
Monotouch: 5.4.0
Mono for Android: Not Installed

Build information:
	Release ID: 30004006
	Git revision: 0cf43d761292de23383842f385fcba4645b03854
	Build date: 2012-09-06 21:36:19+0000
	Xamarin addins: 75a3c9ec1a014eebf0f8346280ba8d7ad9629d3d-dirty
Operating System:
	Mac OS X 10.8.0
	Darwin Macintosh-5.local 12.0.0 Darwin Kernel Version 12.0.0
	    Sun Jun 24 23:00:16 PDT 2012
	    root:xnu-2050.7.9~1/RELEASE_X86_64 x86_64

Loaded Assemblies:


Loaded assemblies:
NSch                                       1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/NSch.dll
MonoDevelop.Database.CodeGenerator         2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.CodeGenerator.dll
MonoDeveloperExtensions_nunit              0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDeveloperExtensions/MonoDeveloperExtensions_nunit.dll
MonoDevelop.RegexToolkit                   2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.RegexToolkit/MonoDevelop.RegexToolkit.dll
OldNRefactory                              2.1.1.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/OldNRefactory.dll
ICSharpCode.Decompiler                     0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/ICSharpCode.Decompiler.dll
System.Web                                 4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System.Web/4.0.0.0__b03f5f7f11d50a3a/System.Web.dll
Mono.Cecil.Mdb                             0.9.5.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/Mono.Cecil.Mdb.dll
MonoDevelop.Debugger.Soft.IPhone           0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.IPhone/MonoDevelop.Debugger.Soft.IPhone.dll
MonoDevelop.Debugger.Soft.AspNet           0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Debugger.Soft/MonoDevelop.Debugger.Soft.AspNet.dll
MonoDevelop.Debugger.Soft.MonoMac          0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoMac/MonoDevelop.Debugger.Soft.MonoMac.dll
MonoDevelop.Debugger.Soft.MonoDroid        0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoDroid/MonoDevelop.Debugger.Soft.MonoDroid.dll
MonoDevelop.Debugger.Soft                  2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Debugger.Soft/MonoDevelop.Debugger.Soft.dll
Mono.Debugger.Soft                         0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Debugger.Soft/Mono.Debugger.Soft.dll
Mono.Debugging.Soft                        0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft.dll
ICSharpCode.SharpZipLib                    4.84.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/ICSharpCode.SharpZipLib/4.84.0.0__1b03e6acf1164f73/ICSharpCode.SharpZipLib.dll
MonoDevelop.DocFood                        1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/BackendBindings/MonoDevelop.DocFood.dll
I18N.MidEast                               4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/I18N.MidEast/4.0.0.0__0738eb9f132ed756/I18N.MidEast.dll
I18N.CJK                                   4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/I18N.CJK/4.0.0.0__0738eb9f132ed756/I18N.CJK.dll
I18N.Other                                 4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/I18N.Other/4.0.0.0__0738eb9f132ed756/I18N.Other.dll
I18N.West                                  4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/I18N.West/4.0.0.0__0738eb9f132ed756/I18N.West.dll
I18N.Rare                                  4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/I18N.Rare/4.0.0.0__0738eb9f132ed756/I18N.Rare.dll
I18N                                       4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/I18N/4.0.0.0__0738eb9f132ed756/I18N.dll
MonoDevelop.HexEditor                      2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/DisplayBindings/HexEditor/MonoDevelop.HexEditor.dll
MonoDevelop.AssemblyBrowser                2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/DisplayBindings/AssemblyBrowser/MonoDevelop.AssemblyBrowser.dll
MonoDevelop.Database.Sql.Sqlite            2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Sql.Sqlite.dll
MonoDevelop.Database.Sql.SqlServer         2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Sql.SqlServer.dll
MonoDevelop.Database.Sql.Npgsql            2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Sql.Npgsql.dll
MonoDevelop.Database.Sql.MySql             2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Sql.MySql.dll
MonoDevelop.Database.Designer              2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Designer.dll
MonoDevelop.Database.Query                 2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Query.dll
MonoDevelop.Database.Components            2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Components.dll
MonoDevelop.Database.Sql                   2.2.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Database/MonoDevelop.Database.Sql.dll
Sharpen.Unix                               1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/Sharpen.Unix.dll
ICSharpCode.NRefactory.CSharp              0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/ICSharpCode.NRefactory.CSharp.dll
Mono.Cecil                                 0.9.5.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/Mono.Cecil.dll
ChangeLogAddIn                             2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/ChangeLogAddIn/ChangeLogAddIn.dll
ILAsmBinding                               2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/BackendBindings/ILAsmBinding.dll
MonoDevelop.Projects.Formats.MSBuild       1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/MonoDevelop.Projects.Formats.MSBuild.exe
MonoDevelop.MonoMac                        2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoMac/MonoDevelop.MonoMac.dll
MonoDevelop.MsVisualStudio                 2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MsVisualStudio/MonoDevelop.MsVisualStudio.dll
MonoDevelop.VBNetBinding                   2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/BackendBindings/MonoDevelop.VBNetBinding.dll
ICSharpCode.SharpZipLib                    2.84.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/ICSharpCode.SharpZipLib/2.84.0.0__1b03e6acf1164f73/ICSharpCode.SharpZipLib.dll
Mono.Security                              4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/Mono.Security/4.0.0.0__0738eb9f132ed756/Mono.Security.dll
Xamarin.Ide.Mac                            1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/Xamarin.Ide/Xamarin.Ide.Mac.dll
MonoDevelop.WebReferences                  2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.WebReferences/MonoDevelop.WebReferences.dll
MonoDevelop.GtkCore                        2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.GtkCore/MonoDevelop.GtkCore.dll
libsteticui                                0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.GtkCore/libsteticui.dll
libstetic                                  0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.GtkCore/libstetic.dll
MonoDevelop.AspNet.Mvc                     2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.AspNet.Mvc/MonoDevelop.AspNet.Mvc.dll
MonoDevelop.TextTemplating                 2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.TextTemplating/MonoDevelop.TextTemplating.dll
MonoDevelop.Gettext                        2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/DisplayBindings/Gettext/MonoDevelop.Gettext.dll
MonoDevelop.VersionControl.Subversion.Unix 2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/MonoDevelop.VersionControl.Subversion.Unix.dll
MonoDevelop.VersionControl.Subversion      2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/MonoDevelop.VersionControl.Subversion.dll
Sharpen                                    1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/Sharpen.dll
NGit                                       2.1.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/NGit.dll
MonoDevelop.VersionControl.Git             2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/MonoDevelop.VersionControl.Git.dll
MonoDevelop.AspNet                         2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.AspNet/MonoDevelop.AspNet.dll
MonoDevelop.XmlEditor                      2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.XmlEditor/MonoDevelop.XmlEditor.dll
MonoDevelop.Autotools                      2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Autotools/MonoDevelop.Autotools.dll
MonoDevelop.CBinding                       2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/BackendBindings/MonoDevelop.CBinding.dll
MonoDevelop.Deployment.Linux               2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Deployment/MonoDevelop.Deployment.Linux.dll
MonoDevelop.Deployment                     2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Deployment/MonoDevelop.Deployment.dll
nunit.util                                 2.6.0.12051 /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/NUnit/nunit.util.dll
nunit.framework                            2.6.0.12051 /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/NUnit/nunit.framework.dll
nunit.core.interfaces                      2.6.0.12051 /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/NUnit/nunit.core.interfaces.dll
nunit.core                                 2.6.0.12051 /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/NUnit/nunit.core.dll
MonoDevelop.NUnit                          2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/NUnit/MonoDevelop.NUnit.dll
Mono.Cairo                                 2.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/Mono.Cairo/2.0.0.0__0738eb9f132ed756/Mono.Cairo.dll
MonoDeveloperExtensions                    2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDeveloperExtensions/MonoDeveloperExtensions.dll
Mono.Debugging                             0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/Mono.Debugging.dll
pango-sharp                                2.12.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/pango-sharp/2.12.0.0__35e10195dab3c99f/pango-sharp.dll
Xamarin.AndroidTools                       0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoDroid/Xamarin.AndroidTools.dll
MonoDevelop.CSharpBinding                  2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/BackendBindings/MonoDevelop.CSharpBinding.dll
MonoDevelop.Refactoring                    2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Refactoring/MonoDevelop.Refactoring.dll
monodoc                                    1.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/monodoc/1.0.0.0__0738eb9f132ed756/monodoc.dll
System.Drawing                             4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System.Drawing/4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
MonoDevelop.MonoDroid                      4.0.0.24    /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid.dll
Mono.AndroidTools                          0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoDroid/Mono.AndroidTools.dll
MonoDevelop.IPhone                         2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.IPhone/MonoDevelop.IPhone.dll
MonoDevelop.MacDev                         2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MacDev/MonoDevelop.MacDev.dll
MonoDevelop.DesignerSupport                2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.DesignerSupport/MonoDevelop.DesignerSupport.dll
MacPlatform                                2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MacPlatform.dll
MonoMac                                    0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoMac.dll
MonoDevelop.VersionControl                 2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/VersionControl/MonoDevelop.VersionControl.dll
MonoDevelop.SourceEditor2                  2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/DisplayBindings/SourceEditor/MonoDevelop.SourceEditor2.dll
MonoDevelop.Debugger                       2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.Debugger/MonoDevelop.Debugger.dll
Xamarin.Ide                                1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/Xamarin.Ide/Xamarin.Ide.dll
System.Configuration                       4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System.Configuration/4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
ICSharpCode.NRefactory                     0.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/ICSharpCode.NRefactory.dll
gdk-sharp                                  2.12.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/gdk-sharp/2.12.0.0__35e10195dab3c99f/gdk-sharp.dll
Mono.TextEditor                            1.0.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/Mono.TextEditor.dll
atk-sharp                                  2.12.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/atk-sharp/2.12.0.0__35e10195dab3c99f/atk-sharp.dll
glib-sharp                                 2.12.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/glib-sharp/2.12.0.0__35e10195dab3c99f/glib-sharp.dll
gtk-sharp                                  2.12.0.0    /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/gtk-sharp.dll
Mono.Posix                                 4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/Mono.Posix/4.0.0.0__0738eb9f132ed756/Mono.Posix.dll
Mono.Addins                                0.6.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/Mono.Addins/0.6.0.0__0738eb9f132ed756/Mono.Addins.dll
Mono.Addins.Setup                          0.6.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/Mono.Addins.Setup/0.6.0.0__0738eb9f132ed756/Mono.Addins.Setup.dll
System.Xml                                 4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System.Xml/4.0.0.0__b77a5c561934e089/System.Xml.dll
System.Xml.Linq                            4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System.Xml.Linq/4.0.0.0__b77a5c561934e089/System.Xml.Linq.dll
System.Core                                4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System.Core/4.0.0.0__b77a5c561934e089/System.Core.dll
System                                     4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll
MonoDevelop.Core                           2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/MonoDevelop.Core.dll
MonoDevelop.Ide                            2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/MonoDevelop.Ide.dll
MonoDevelop                                2.6.0.0     /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/MonoDevelop.exe
mscorlib                                   4.0.0.0     /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/mscorlib.dll
Comment 4 Chris Wenham 2012-09-10 14:40:16 UTC
Okay, patience pays. I have a simpler and more reliable use case for reproducing the bug:

1) Load ExchangeRateTest.sln
2) Open ExchangeRates.cs
3) Scroll until body of GetCurrencyName() is visible
4) Set editor insertion caret to the end of line 169 (let region = TryRegionInfo (Country) )
5) Hover the mouse over .ISOCurrencySymbol in the line just below it until the tooltip appears
6) NullReferenceException thrown a couple seconds later

This reproduces the problem in both the test project and my original project.

Could by something about that LINQ statement that's annoying NRefactory.