[Mono-bugs] [Bug 378200] New: [GMCS] NullReferenceException when compiling lambda expression with method call

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https://bugzilla.novell.com/show_bug.cgi?id=378200


           Summary: [GMCS] NullReferenceException when compiling lambda
                    expression with method call
           Product: Mono: Compilers
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: juan.wajnerman at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Description of Problem:
A NullReferenceException is thrown by the compiler (gmcs) when trying to
compile a lambda expression into its corresponding expression tree
(Expression<Func<>>). The same doesn't happen when the expression is compiled
as a delegate (Func<>).

Steps to reproduce the problem:
1. Compile the given example code


Actual Results:
Exception caught by the compiler while compiling:
   Block that caused the problem begin at: Test.cs(6,28):
                     Block being compiled: [Test.cs(7,9):,Test.cs(9,9):]
Mono.CSharp.InternalErrorException: Test.cs(8,47):
Internal compiler error at Test.cs(6,28):: exception caught while emitting
MethodBuilder [Test::Main]

Unhandled Exception: Mono.CSharp.InternalErrorException: Test.cs(8,47): --->
System.NullReferenceException: Object reference not set to an instance of an
object
  at Mono.CSharp.Invocation.CreateExpressionTree (Mono.CSharp.EmitContext ec)
[0x00000]
  at Mono.CSharp.ContextualReturn.CreateExpressionTree (Mono.CSharp.EmitContext
ec) [0x00000]
  at Mono.CSharp.ToplevelBlock.CreateExpressionTree (Mono.CSharp.EmitContext
ec) [0x00000]
  at Mono.CSharp.LambdaExpression.CreateExpressionTree (Mono.CSharp.EmitContext
ec, System.Type delegate_type) [0x00000]
  at Mono.CSharp.AnonymousMethodExpression.Compatible (Mono.CSharp.EmitContext
ec, System.Type type) [0x00000] --- End of inner exception stack trace ---

  at Mono.CSharp.AnonymousMethodExpression.Compatible (Mono.CSharp.EmitContext
ec, System.Type type) [0x00000]
  at Mono.CSharp.Convert.ImplicitConversionStandard (Mono.CSharp.EmitContext
ec, Mono.CSharp.Expression expr, System.Type target_type, Location loc)
[0x00000]
  at Mono.CSharp.Convert.ImplicitConversion (Mono.CSharp.EmitContext ec,
Mono.CSharp.Expression expr, System.Type target_type, Location loc) [0x00000]
  at Mono.CSharp.Convert.ImplicitConversionRequired (Mono.CSharp.EmitContext
ec, Mono.CSharp.Expression source, System.Type target_type, Location loc)
[0x00000]
  at Mono.CSharp.Assign.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]


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