[Mono-bugs] [Bug 356197] New: using a using block within a delegate causes segfault

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=356197


           Summary: using a using block within a delegate causes segfault
           Product: Mono: Compilers
           Version: 1.2.6
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: jeffames at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=191787)
 --> (https://bugzilla.novell.com/attachment.cgi?id=191787)
test case

Doing something of the form:

    public static void MyAction(Action<Object> action)
    {
        action(myObject);
    }        

    public static void Main(string[] args)
    {
        MyAction(delegate(Object obj)
                 {
                     using (DisposableClass dc = new DisposableClass())
                     {
                     }
                 });
    }

causes the compile to fail, though if the using() block is removed,
it compiles fine.

$ gmcs test.cs
Exception caught by the compiler while compiling:
   Block that caused the problem begin at: test.cs(21):
                     Block being compiled: [test.cs(22):,test.cs(29):]
Mono.CSharp.InternalErrorException: test.cs(23):
Internal compiler error at test.cs(21):: exception caught while emitting
MethodBuilder [Test::Main]

Unhandled Exception: Mono.CSharp.InternalErrorException: test.cs(23): --->
System.InvalidCastException: Cannot cast from source type to destination type.
  at Mono.CSharp.Using.CloneTo (Mono.CSharp.CloneContext clonectx,
Mono.CSharp.Statement t) [0x00000] 
  at Mono.CSharp.Statement.Clone (Mono.CSharp.CloneContext clonectx) [0x00000] 
  at Mono.CSharp.Block.CloneTo (Mono.CSharp.CloneContext clonectx,
Mono.CSharp.Statement t) [0x00000] 
  at Mono.CSharp.ExplicitBlock.CloneTo (Mono.CSharp.CloneContext clonectx,
Mono.CSharp.Statement t) [0x00000] 
  at Mono.CSharp.Statement.Clone (Mono.CSharp.CloneContext clonectx) [0x00000] 
  at Mono.CSharp.Block.CloneTo (Mono.CSharp.CloneContext clonectx,
Mono.CSharp.Statement t) [0x00000] 
  at Mono.CSharp.ExplicitBlock.CloneTo (Mono.CSharp.CloneContext clonectx,
Mono.CSharp.Statement t) [0x00000] 
  at Mono.CSharp.ToplevelBlock.CloneTo (Mono.CSharp.CloneContext clonectx,
Mono.CSharp.Statement t) [0x00000] 
  at Mono.CSharp.Statement.Clone (Mono.CSharp.CloneContext clonectx) [0x00000] 
  at Mono.CSharp.Statement.PerformClone () [0x00000] 
  at Mono.CSharp.AnonymousMethodExpression.CompatibleMethod
(Mono.CSharp.EmitContext ec, Mono.CSharp.TypeInferenceContext tic, System.Type
return_type, System.Type delegate_type) [0x00000] 
  at Mono.CSharp.AnonymousMethodExpression.Compatible (Mono.CSharp.EmitContext
ec, System.Type delegate_type) [0x00000] --- End of inner exception stack trace
---

  at Mono.CSharp.AnonymousMethodExpression.Compatible (Mono.CSharp.EmitContext
ec, System.Type delegate_type) [0x00000] 
  at Mono.CSharp.AnonymousMethodExpression.ImplicitStandardConversionExists
(System.Type delegate_type) [0x00000] 
  at Mono.CSharp.Convert.ImplicitStandardConversionExists
(Mono.CSharp.Expression expr, System.Type target_type) [0x00000] 
  at Mono.CSharp.Convert.ImplicitConversionExists (Mono.CSharp.EmitContext ec,
Mono.CSharp.Expression expr, System.Type target_type) [0x00000] 
  at Mono.CSharp.MethodGroupExpr.IsApplicable (Mono.CSharp.EmitContext ec,
System.Collections.ArrayList arguments, Int32 arg_count,
System.Reflection.MethodBase& method) [0x00000] 
  at Mono.CSharp.MethodGroupExpr.OverloadResolve (Mono.CSharp.EmitContext ec,
System.Collections.ArrayList Arguments, Boolean may_fail, Location loc)
[0x00000] 
  at Mono.CSharp.Invocation.DoResolveOverload (Mono.CSharp.EmitContext ec)
[0x00000] 
  at Mono.CSharp.Invocation.DoResolve (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.Expression.Resolve (Mono.CSharp.EmitContext ec, ResolveFlags
flags) [0x00000] 
  at Mono.CSharp.Expression.Resolve (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.ExpressionStatement.ResolveStatement (Mono.CSharp.EmitContext
ec) [0x00000] 
  at Mono.CSharp.StatementExpression.Resolve (Mono.CSharp.EmitContext ec)
[0x00000] 
  at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.EmitContext.ResolveTopBlock (Mono.CSharp.EmitContext
anonymous_method_host, Mono.CSharp.ToplevelBlock block, Mono.CSharp.Parameters
ip, IMethodData md, System.Boolean& unreachable) [0x00000] 

$ gmcs --version
Mono C# compiler version 1.2.6.0


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