[Mono-bugs] [Bug 418312] New: gmcs crashes with complex lambda expressions

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=418312


           Summary: gmcs crashes with complex lambda expressions
           Product: Mono: Compilers
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: msafar at novell.com
        ReportedBy: jbevain at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Repro:

<<<<<<<<<<<<<
using System;
using System.Linq;
using System.Collections.Generic;

static class CurryBug
{       // curry for function of arity 3
        //
        // this compiles
        public static Func<int,Func<int, Func<int,int>>>
                curry_for_int_func (this Func<int,int,int,int> f)
        {
                return arg1 => arg2 => arg3 => f(arg1 , arg2 , arg3);
        }

        // but his does not
        static Func<A,Func<B,Func<C,D>>> curry<A,B,C,D> (this Func<A,B,C,D> f)
        {
                return arg1 => arg2 => arg3 => f(arg1, arg2, arg3);
        }

        static void Main ()
        {
                Func<int,int,int,int> plus = (x, y, z) => x + y + z;

                Console.WriteLine(plus.curry()(7)(23)(47));
        }
}
<<<<<<<<<<

Compiles with csc and outputs 77.

Stacktrace:

<<<<<<<<<<
[mono] ~/Desktop @ gmcs curry_bug.cs 
Exception caught by the compiler while emitting:
   Block that caused the problem begin at: curry_bug.cs(12,40):
System.Exception: Trying to emit a local from a different ILGenerator.
Internal compiler error at curry_bug.cs(12,37):: exception caught while
emitting MethodBuilder [<curry_for_int_func>c__AnonStorey1::<>m__3]

Unhandled Exception: System.Exception: Trying to emit a local from a different
ILGenerator.
  at System.Reflection.Emit.ILGenerator.Emit (OpCode opcode,
System.Reflection.Emit.LocalBuilder local) [0x00000] 
  at Mono.CSharp.LocalTemporary.Emit (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.FieldExpr.EmitAssign (Mono.CSharp.EmitContext ec,
Mono.CSharp.Expression source, Boolean leave_copy, Boolean prepare_for_load)
[0x00000] 
  at Mono.CSharp.Assign.Emit (Mono.CSharp.EmitContext ec, Boolean is_statement)
[0x00000] 
  at Mono.CSharp.Assign.EmitStatement (Mono.CSharp.EmitContext ec) [0x00000] 
  at Mono.CSharp.AnonymousMethodStorey.EmitHoistedFieldsInitialization
(Mono.CSharp.EmitContext ec) [0x00000] 
  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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