[Mono-bugs] [Bug 457082] New: Nested Lambdas fail to compile in generic method

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=457082


           Summary: Nested Lambdas fail to compile in generic method
           Product: Mono: Compilers
           Version: 2.2.x
          Platform: 64bit
        OS/Version: Linux
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: mono at e-tobi.net
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=258464)
 --> (https://bugzilla.novell.com/attachment.cgi?id=258464)
Sample Code

This simple piece of code:

namespace Foo
{
    public class Foo
    {
        public void DoSomething<T>()
        {
            Action<string> action1 = aString =>
            {
                Action<string> action2 = anotherString => 
                {
                    aString.Insert(0, anotherString);
                };
            };
        }
    }
}

fails to compile (gmcs from the version 2.2 branch) with:

test.cs(11,32): warning CS0219: The variable `action2' is assigned but its
value is never used
test.cs(9,28): warning CS0219: The variable `action1' is assigned but its value
is never used
Exception caught by the compiler while emitting:
   Block that caused the problem begin at: test.cs(10,13):
System.NullReferenceException: Object reference not set to an instance of an
object
Internal compiler error at test.cs(9,46):: exception caught while emitting
MethodBuilder [Foo::<DoSomething>m__1]

Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object
  at Mono.CSharp.AnonymousMethodStorey.EmitHoistedVariables
(Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.ExplicitBlock.Emit (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.ToplevelBlock.Emit (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.EmitContext.EmitResolvedTopBlock (Mono.CSharp.ToplevelBlock
block, Boolean unreachable) [0x00000] 
  at Mono.CSharp.EmitContext.EmitTopBlock (IMethodData md,
Mono.CSharp.ToplevelBlock block) [0x00000]


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